African Dorylus raid

The name army ant (or legionary ant or marabunta[1]) is applied to over 200 ant species in different lineages. Because of their aggressive predatory foraging groups, known as "raids", a huge number of ants forage simultaneously over a limited area.[2]

Another shared feature is that, unlike most ant species, army ants do not construct permanent nests; an army ant colony moves almost incessantly over the time it exists. All species are members of the true ant family, Formicidae, but several groups have independently evolved the same basic behavioural and ecological syndrome. This syndrome is often referred to as "legionary behaviour", and may be an example of convergent evolution.[3][n 1]

Most New World army ants belong to the genera Cheliomyrmex, Neivamyrmex, Nomamyrmex, Labidus, and Eciton.[3] The largest genus is Neivamyrmex, which contains more than 120 species; the most predominant species is Eciton burchellii; its common name "army ant" is considered to be the archetype of the species. Most Old World army ants are divided between the tribes Aenictini and Dorylini. Aenictini contains more than 50 species of army ants in the single genus, Aenictus. However, the Dorylini contain the genus Dorylus, the most aggressive group of driver ants; 70 species are known.

Originally, some of the Old World and New World lineages of army ants were thought to have evolved independently, in an example of convergent evolution. In 2003, though, genetic analysis of various species suggests that several of these groups evolved from a single common ancestor, which lived approximately 100 million years ago at the time of the separation of the continents of Africa and South America, while other army ant lineages (Leptanillinae, plus members of Ponerinae, Amblyoponinae, and Myrmicinae) are still considered to represent independent evolutionary events.[3] Army ant taxonomy remains in flux, and genetic analysis will likely continue to provide more information about the relatedness of the various taxa.[4]

Morphology

An Eciton burchellii soldier guarding workers

Workers

The workers of army ants are usually blind or can have compound eyes that are reduced to a single lens. There are species of army ants where the worker caste may show polymorphism based on physical differences and job allocations; however, there are also species that show no polymorphism at all.[5] The worker caste is usually composed of sterile female worker ants.[6]

Soldiers

The soldiers of army ants are larger than the workers, and they have much larger mandibles than the worker class of ants, with older soldiers possessing larger heads and stronger mandibles than the younger ones. They protect the colony, and help carry the heaviest loads of prey to the colony bivouac.

Males

Males are large in size and have a large cylindrical abdomen, highly modified mandibles and uncommon genitalia not seen in other ants.[7] They have 13 segments on their antennae, are alated (have wings) and therefore can resemble wasps.[5] Males are born as part of a sexual brood.[7] As soon as they are born, they will fly off in search of a queen to mate with. In some instances where males seek to mate with a queen from an existing colony, the receiving workers will forcibly remove the wings in order to accommodate the large males into the colony for mating.[8] Because of their size, males are sometimes called "sausage flies" or "sausage ants."[9]

Queen

Colonies of real army ants always have only one queen, while some other ant species can have several queens. The queen is dichthadiigyne (a blind ant with large gaster) but may sometimes possess vestigial eyes.[5] The queens of army ants are unique in that they do not have wings, have an enlarged gaster size and an extended cylindrical abdomen.[8] They are significantly larger than worker army ants and possess 10–12 segments on their antennae.[5] Queens will mate with multiple males and because of their enlarged gaster, can produce 3 to 4 million eggs a month, resulting in synchronized brood cycles and colonies composed of millions of individuals all related to a single queen.[5][10]

Behaviour

E. vagans with larvae of a raided wasp nest
Dorylus sp. in Cameroon, consuming a grasshopper
Safari ants (Dorylus sp.) on a march in Kakamega Forest, Kenya. A column of workers moves under the protection of the soldiers, who link together into a tunnel and display their mandibles to ward off predators

Army ant syndrome

The term "army ant syndrome" refers to behavioral and reproductive traits such as obligate collective foraging, nomadism and highly specialized queens that allow these organisms to become the most ferocious social hunters.[3]

Most ant species will send individual scouts to find food sources and later recruit others from the colony to help; however, army ants dispatch a cooperative, leaderless group of foragers to detect and overwhelm the prey at once.[3][5] Army ants do not have a permanent nest but instead form many bivouacs as they travel. The constant traveling is due to the need to hunt large amounts of prey to feed its enormous colony population.[5] Their queens are wingless and have abdomens that expand significantly during egg production.[8] This allows for the production of 3–4 million eggs every month and often results in synchronized brood cycles, thus each colony will be formed of millions of individuals that descend from a single queen. These three traits are found in all army ant species and are the defining traits of army ants.[3][11]

Nomadic and stationary phase

Army ants have two phases of activity – a nomadic (wandering) phase and a stationary (statary) phase – that constantly cycle, and can be found throughout all army ant species.[8]

The nomadic phase begins around 10 days after the queen lays her eggs. This phase will last approximately 15 days to let the larvae develop. The ants move during the day, capturing insects, spiders, and small vertebrates to feed their brood. At dusk, they will form their nests or bivouac, which they change almost daily.[8] At the end of the nomadic phase, the larvae will spin pupal cases and no longer require food. The colony can then live in the same bivouac site for around 20 days, foraging only on approximately two-thirds of these days.[2][8] Among the army ants are some species that venture out only at night, but no adequate studies of their activities have been made.

The stationary phase, which lasts about two to three weeks, begins when the larvae pupate. From this point on, the prey that were previously fed to the larvae are now fed exclusively to the queen.[8] The abdomen (gaster) of the queen swells significantly, and she lays her eggs. At the end of the stationary phase, both the pupae emerge from their cocoons (eclosion) and the next generation of eggs hatch so the colony has a new group of workers and larvae. After this, the ants resume the nomadic phase.[5][8]

Behaviour and organization of a bivouac

Colony fission

Army ants will split into groups when the size of the colony has reached a size threshold, which happens approximately every three years.[12] Wingless virgin queens will hatch among a male sexual brood that hatches at a later date. When the colony fissions, there are two ways new queens are decided. A possible outcome is a new queen will stay at the original nest with a portion of the workers and the male brood while the old queen will leave with the rest of the workers and find a new nest. Another possibility is that the workers will reject the old queen and new queens will each head a newly-divided colony.[2][8] The workers will affiliate with individual queens based on the pheromone cues that are unique to each queen. When new bivouacs are formed, communication between the original colony and the new bivouacs will cease.[8]

Queen behaviour

Being the largest ants on Earth, army ants, such as African Dorylus queens have the greatest reproductive potential among insects, with an egg-laying capacity of several million per month. Army ant queens never have to leave the protection of the colony, where they mate with foreign incoming males which disperse on nuptial flights. The exact mating behaviour of the army ant queen is still unknown, but observations seem to imply that queens may be fertilized by multiple males.[13] Due to the queen's large reproductive potential, a colony of army ants can be descended from a single queen.[10]

When the queen ant dies, there is no replacement and army ants cannot rear emergency queens. Most of the time, if the queen dies, the colony will likely die too. Queen loss can occur due to accidents during emigrations, predator attack, old age or illness.[12] However, there are possibilities to avoid colony death. When a colony loses its queen, the worker ants will usually fuse with another colony that has a queen, within a few days.[6][14] Sometimes, the workers will backtrack along the paths of prior emigrations to search for a queen that has been lost or merge with a sister colony.[14][15] By merging with a related colony, the workers would increase their overall inclusive fitness.[12] The workers that merge into a new colony may cause the colony to increase in size by 50%.

Sexual selection by workers

Workers in army ant species have a unique role in selecting both the queen and the male mate.

When the queens emerge, the workers in the colony will form two 'systems' or arms in opposite directions. These queens that are hatched will move down either of the arms and only two queens will succeed, one for each branch. Any remaining new queens will be left in the middle and are abandoned. Two new bivouacs will be formed and break off into different directions. The workers will surround the two to-be queens to ensure they survive. These workers that surround the queens are affected by the CHC (pheromone) profile emitted by the new queen.[8]

When males hatch from their brood, they will fly off to find a mate. For males to access the queen and mate, they must run through the workers in the colony. Males that are favoured are superficially similar in size and shape to the queen. The males also produce large quantities of pheromones to pacify the worker ants.[8]

Reproduction responsibilities and problems

In a colony, the queen is the primary individual responsible for reproduction in the colony. Analysis of genotypes have confirmed that workers are, on average, more closely related to the offspring of the queen than to that of other workers, and that workers rarely, if ever, reproduce.[16] Three factors have been suggested to rationalize the loss of worker reproduction in the presence of a queen. First, if the worker reproduces, it lowers the general performance of the colony because it is not working. Second, workers increase their inclusive fitness by policing other workers because they themselves are more related to the queen's offspring than other worker's offspring.[16] Lastly, the large male larvae become too large to be transported, forcing colonies with a sexual brood to nest for a period of 41–56 days, as compared to non-reproductive colonies that remain in the nest an average of 17 days before returning to a nomadic phase. This suggests that if workers produced male offspring, they might be hatched out of sync with the queen's sexual brood and not likely to be successfully reared to adulthood.[16]

Foraging

The whole colony of army ants can consume up to 500,000 prey animals each day, so can have a significant influence on the population, diversity, and behaviour of their prey.[17] The prey selection differs with the species. Underground species prey primarily on ground-dwelling arthropods and their larvae, earthworms, and occasionally also the young of vertebrates, turtle eggs, or oily seeds. A majority of the species, the "colony robbers", specialize in the offspring of other ants and wasps. Only a few species seem to have the very broad spectrum of prey seen in the raiding species. Even these species do not eat every kind of animal. Although small vertebrates that get caught in the raid will be killed, the jaws of the American Eciton are not suited to this type of prey, in contrast to the African Dorylus. These undesired prey are simply left behind and consumed by scavengers or by the flies that accompany the ant swarm. Only a few species hunt primarily on the surface of the earth; they seek their prey mainly in leaf litter and in low vegetation. About five species hunt in higher trees, where they can attack birds and their eggs, although they focus on hunting other social insects along with their eggs and larvae. Colonies of army ants are large compared to the colonies of other Formicidae. Colonies can have over 15 million workers and can transport 3000 prey (items) per hour during the raid period.[13][18]

When army ants forage, the trails that are formed can be over 20 m (66 ft) wide and over 100 m (330 ft) long.[18] They stay on the path through the use of a concentration gradient of pheromones. The concentration of pheromone is highest in the middle of the trail, splitting the trail into two distinct regions: an area with high concentration and two areas with low concentrations of pheromones. The outbound ants will occupy the outer two lanes and the returning ants will occupy the central lane.[18] The returning worker ants have also been found to emit more pheromones than those leaving the nest, causing the difference in concentration of pheromone in the trails.[19] The pheromones will allow foraging to be much more efficient by allowing the army ants to avoid their own former paths and those of their conspecifics.[17] Scaffolds structure has been observed when workers carried heavy prey food to inclined surface. Walking ants are prevented from falling by other ants.[20]

While foraging, army ants cause many invertebrates to flee from their hiding places under leaves of the forest floor, under tree bark, and other such locations, thereby allowing predators to catch them more easily. For example, in the tropical rainforests of Panama, swarms of army ants attract many species of birds to this feast of scrambling insects, spiders, scorpions, worms, and other animals. Some of these birds are named "antbirds" due to this tendency.[21] While focused on feeding on these invertebrates, birds at army-ant swarms typically allow very close approach by people – within 1–2 metres (3.3–6.6 ft) in many cases – often providing the best opportunities to see many of these species. Depending on the size of the ant swarm and the amount of prey the ants stir up, birds can number from a few to dozens of individuals. Birds that frequent army-ant swarms include the white-whiskered puffbird, rufous motmot, rufous-vented ground cuckoo, grey-cowled wood rail, plain-brown woodcreeper, northern barred woodcreeper, cocoa woodcreeper, black-striped woodcreeper, fasciated antshrike, black-crowned antshrike, spotted antbird, bicolored antbird, ocellated antbird, chestnut-backed antbird, black-faced antthrush, and gray-headed tanager.[22]

Nesting

Eciton sp. forming a bridge

Army ants do not build a nest like most other ants. Instead, they build a living nest with their bodies, known as a bivouac. Bivouacs tend to be found in tree trunks or in burrows dug by the ants. The members of the bivouac hold onto each other's legs and so build a sort of ball, which may look unstructured to a layman's eyes, but is actually a well-organized structure.[23] The older female workers are located on the exterior; in the interior are the younger female workers. At the smallest disturbance, soldiers gather on the top surface of the bivouac, ready to defend the nest with powerful mandibles and (in the case of the Aenictinae and Ecitoninae) stingers. Inside the nest, there are numerous passages that have 'chambers' of food, larvae, eggs, and most importantly, the queen.[24]

Symbionts

Many species of army ants are widely considered to be keystone species[25] due to their important ecological role as arthropod predators [26] and due to their large number of vertebrate and invertebrate associates that rely on army ant colonies for nutrition or protection.[27][28][29] During their hunt, many surface-raiding army ants are accompanied by various birds, such as antbirds, thrushes, ovenbirds and wrens, which devour the insects that are flushed out by the ants, a behavior known as kleptoparasitism.[30][31] A wide variety of arthropods including staphylinid beetles, histerid beetles, spiders, silverfish, isopods, and mites also follow colonies.[32] While some guests follow the colony emigrations on foot,[33][34][29] many others are phoretically transported, for example by attaching themseles on army ant workers such as the histerid beetle Nymphister kronaueri.[35] The Neotropical army ant Eciton burchellii has an estimated 350 to 500 animal associates, the most of any one species known to science.[29]

Taxonomy

Historically, "army ant" in the broad sense referred to various members of five different ant subfamilies. In two of these cases, the Ponerinae and Myrmicinae, only a few species and genera exhibit legionary behavior; in the other three lineages, Ecitoninae, Dorylinae, and Leptanillinae, all of the constituent species were considered to be legionary. More recently, ant classifications now recognize an additional New World subfamily, Leptanilloidinae, which also consists of obligate legionary species, so is another group now included among the army ants.[36]

A 2003 study of thirty species (by Sean Brady of Cornell University) indicates that army ants of subfamilies Ecitoninae (South America), Dorylinae (Africa) and Aenictinae (Asia) together formed a monophyletic group, based on data from three molecular genes and one mitochondrial gene. Brady concluded that these groups are, therefore, a single lineage that evolved in the mid-Cretaceous period in Gondwana,[n 2] so these subfamilies are now generally united into a single subfamily Dorylinae, though this is still not universally recognized.[38] However, the unification of these lineages means that the only subfamily that is composed solely of legionary species is Leptanillinae, as Dorylinae contains many non-legionary genera.

Accordingly, the "army ants" as presently recognized consist of legionary species in these genera:

Subfamily Dorylinae (Aenictinae, Aenictogitoninae, Cerapachyinae, Ecitoninae and Leptanilloidinae, 2014)[39]
Subfamily Leptanillinae
Subfamily Myrmicinae
Subfamily Ponerinae
Subfamily Amblyoponinae

See also

Notes

  1. ↑ "There are also interesting [evolutionary] convergences within the ants. Although most ant colonies live a settled existence in a fixed nest, there seems to be a successful living to be made by wandering in enormous pillaging armies. This is called the legionary habit." (Dawkins 1986)
  2. ↑ "Because army ants are found almost everywhere, scientists postulated that they evolved many times after the break-up and dispersal of the supercontinent Gondwana just over 100 million years ago. The conventional view of the evolution of army ants needs a revision because of new data obtained by Sean Brady, a Cornell University, US, entomologist who has discovered that these ants evolved from a common ancestor."(Whitehouse 2003)[37]

References

  1. ↑ Dejean, Alain; Azémar, Frédéric; Roux, Olivier (2014-07-01). "An invasive ant species able to counterattack marabunta raids". Comptes Rendus Biologies. 337 (7): 474–479. doi:10.1016/j.crvi.2014.05.004. ISSN 1631-0691. PMID 25103833.
  2. 1 2 3 Schneirla, Theodore Christian (1971). Topoff, Howard R. (ed.). Army Ants: A Study in Social Organization. San Francisco: W. H. Freeman and Company. ISBN 978-0-7167-0933-6. OCLC 210501.
  3. 1 2 3 4 5 6 Brady, Seán G. (2003). "Evolution of the army ant syndrome: The origin and long-term evolutionary stasis of a complex of behavioral and reproductive adaptations". Proceedings of the National Academy of Sciences of the United States of America. 100 (11): 6575–6579. Bibcode:2003PNAS..100.6575B. doi:10.1073/pnas.1137809100. PMC 164488. PMID 12750466.
  4. ↑ "Army Ants Harbor a Host-Specific Clade of Entomoplasmatales Bacteria". ResearchGate. Retrieved 2019-04-04.
  5. 1 2 3 4 5 6 7 8 Gotwald, William H. Jr. (2 December 2012). "Army Ants". Social Insects. Vol. 4. Elsevier. pp. 157–254. ISBN 9780323152167. in Hermann 1982
  6. 1 2 Bourke, Andrew F. G; Franks, Nigel R. (1995). Social Evolution in Ants. Monographs in Behavior and Ecology. Princeton, NJ: Princeton University Press. ISBN 978-0-691-04426-2. OCLC 32087436.
  7. 1 2 Trager, James C., ed. (1988). Advances in Myrmecology. Leiden, NL: E.J. Brill. ISBN 978-0-916846-38-1. OCLC 468279677.
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  9. ↑ "Driver Ants – info and games". www.sheppardsoftware.com. Retrieved 2019-04-04.
  10. 1 2 Kronauer, Daniel J. C.; Schöning, Caspar; Pedersen, Jes S. S.; Boomsma, Jacobus J.; Gadau, Jurgen R. (2004). "Extreme queen-mating frequency and colony fission in African army ants". Molecular Ecology. 13 (8): 2381–2388. doi:10.1111/j.1365-294X.2004.02262.x. PMID 15245410. S2CID 13887869.
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  13. 1 2 Kronauer, Daniel J. C.; Johnson, Robert A.; Boomsma, Jacobus J. (2007). "The Evolution of multiple mating in army ants". Evolution. 61 (2): 413–422. doi:10.1111/j.1558-5646.2007.00040.x. PMID 17348950. S2CID 36371272.
  14. 1 2 Kronauer, Daniel J. C.; Schöning, Caspar; d'Ettorre, Patricia; Boomsma, Jacobus J. (2010). "Colony fusion and worker reproduction after queen loss in army ants". Proceedings of the Royal Society B: Biological Sciences. 277 (1682): 755–763. doi:10.1098/rspb.2009.1591. PMC 2842746. PMID 19889701.
  15. ↑ Schneirla, Theodore Christian (1949). "Army-ant Life and Behavior under Dry-season Conditions. 3, The Course of Reproduction and Colony Behavior" (PDF). Bulletin of the AMNH. 94. hdl:2246/407.
  16. 1 2 3 Kronauer, Daniel J. C.; Schöning, Caspar; Boomsma, Jacobus J. (2006). "Male parentage in army ants". Molecular Ecology. 15 (4): 1147–1151. doi:10.1111/j.1365-294X.2005.02850.x. PMID 16599973. S2CID 8393095.
  17. 1 2 Franks, Nigel R.; Fletcher, Charles R. (1983). "Spatial Patterns in Army Ant Foraging and Migration: Eciton burchelli on Barro Colorado Island, Panama". Behavioral Ecology and Sociobiology. 12 (4): 261–270. doi:10.1007/BF00302894. S2CID 30296073.
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  20. ↑ Reid, Chris; Carlesso, Daniele (April 19, 2021). "Bridges, highways, scaffolds: how the amazing engineering of army ants can make us smarter creators". The Conversation. Retrieved 2021-04-20.
  21. ↑ Angehr G, Dean R. 2010. The birds of Panama: a field guide. Cornell Univ. Press, Ithaca, New York. 456 pp.
  22. ↑ Kent Livezey, Birding Pipeline Panama, Panama City, Panama
  23. ↑ Dawkins, Richard (1996) [1986]. "4. Making Tracks Through Animal Space". The Blind Watchmaker: Why the Evidence of Evolution Reveals a Universe Without Design. W. W. Norton & Company. p. 107. ISBN 978-0-393-31570-7.
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  26. ↑ Hoenle, Philipp O.; Blüthgen, Nico; Brückner, Adrian; Kronauer, Daniel J. C.; Fiala, Brigitte; Donoso, David A.; Smith, M. Alex; Jara, Bryan Ospina; Beeren, Christoph von (2019). "Species-level predation network uncovers high prey specificity in a Neotropical army ant community". Molecular Ecology. 28 (9): 2423–2440. doi:10.1111/mec.15078. ISSN 1365-294X. PMID 31050080. S2CID 143433968.
  27. ↑ Boswell, Graeme P.; Britton, Nicholas F.; Franks, Nigel R. (1998). "Habitat fragmentation, percolation theory and the conservation of a keystone species". Proceedings of the Royal Society B. 265 (1409): 1921–1925. doi:10.1098/rspb.1998.0521. PMC 1689475.
  28. ↑ von Beeren, Christoph; Blüthgen, Nico; Hoenle, Philipp O.; Pohl, Sebastian; Brückner, Adrian; Tishechkin, Alexey K.; Maruyama, Munetoshi; Brown, Brian V.; Hash, John M.; Hall, W. E.; Kronauer, Daniel J. C. (2021). "A remarkable legion of guests: Diversity and host specificity of army ant symbionts". Molecular Ecology. 30 (20): 5229–5246. doi:10.1111/mec.16101. ISSN 1365-294X. PMID 34406688. S2CID 237199045.
  29. 1 2 3 Rettenmeyer, C. W.; Rettenmeyer, M. E.; Joseph, J.; Berghoff, S. M. (2011-08-01). "The largest animal association centered on one species: the army ant Eciton burchellii and its more than 300 associates". Insectes Sociaux. 58 (3): 281–292. doi:10.1007/s00040-010-0128-8. ISSN 1420-9098. S2CID 32688600.
  30. ↑ Wrege, Peter H.; Wikelski, M.; Mandel, J. T.; Rassweiler, T.; Couzin, I. D. (2005). "Antbirds parasitize foraging army ants". Ecology. 8 (3): 555–559. doi:10.1890/04-1133. S2CID 1704704.
  31. ↑ Willis, Edwin O.; Oniki, Yoshika (1978). "Birds and Army Ants". Annual Review of Ecology and Systematics. 9 (1): 243–263. doi:10.1146/annurev.es.09.110178.001331. ISSN 0066-4162 – via ResearchGate.
  32. ↑ Kronauer, Daniel J. C. (2020). Army Ants. Cambridge, MA. ISBN 978-0-674-24941-7. OCLC 1224277932.{{cite book}}: CS1 maint: location missing publisher (link)
  33. ↑ von Beeren, Christoph; Maruyama, Munetoshi; Kronauer, Daniel J. C. (2016). "Cryptic diversity, high host specificity and reproductive synchronization in army ant-associated Vatesus beetles". Molecular Ecology. 25 (4): 990–1005. doi:10.1111/mec.13500. ISSN 1365-294X. PMID 26618779. S2CID 22773782.
  34. ↑ von Beeren, Christoph; Maruyama, Munetoshi; Kronauer, Daniel J. C. (2016-11-09). "Community Sampling and Integrative Taxonomy Reveal New Species and Host Specificity in the Army Ant-Associated Beetle Genus Tetradonia (Coleoptera, Staphylinidae, Aleocharinae)". PLOS ONE. 11 (11): e0165056. Bibcode:2016PLoSO..1165056V. doi:10.1371/journal.pone.0165056. ISSN 1932-6203. PMC 5102370. PMID 27829037.
  35. ↑ von Beeren, Christoph; Tishechkin, Alexey K. (2017-02-10). "Nymphister kronaueri von Beeren & Tishechkin sp. nov., an army ant-associated beetle species (Coleoptera: Histeridae: Haeteriinae) with an exceptional mechanism of phoresy". BMC Zoology. 2 (1): 3. doi:10.1186/s40850-016-0010-x. ISSN 2056-3132.
  36. ↑ J.C Kronauer, Daniel (10 November 2008). "Recent advances in army ant biology (Hymenoptera: Formicidae)". Myrmecological News. 12: 51–65. eISSN 1997-3500. ISSN 1994-4136. S2CID 17965336.
  37. ↑ Whitehouse, David (2003-05-10). "Ant history revealed". Science & Environment. BBC News Online. Retrieved 2009-01-14.
  38. ↑ Engel, Michael S.; Grimaldi, David A. (2005). "Primitive new ants in Cretaceous amber from Myanmar, New Jersey, and Canada (Hymenoptera: Formicidae)" (PDF). American Museum Novitates (3485): 1–24. doi:10.1206/0003-0082(2005)485[0001:PNAICA]2.0.CO;2. hdl:2246/5676. S2CID 84043939.
  39. ↑ Brady, Seán G; Fisher, Brian L; Schultz, Ted R; Ward, Philip S (2014). "The rise of army ants and their relatives: diversification of specialized predatory doryline ants". BMC Evolutionary Biology. 14: 2–14. doi:10.1186/1471-2148-14-93. PMC 4021219. PMID 24886136.

Bibliography

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