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Cited by 348

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A cold-blooded view of adaptive immunity

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Flajnik, Martin F.·2018·Nature Reviews Immunology

Abstract

The adaptive immune system arose 500 million years ago in ectothermic (cold-blooded) vertebrates. Classically, the adaptive immune system has been defined by the presence of lymphocytes expressing recombination-activating gene (RAG)-dependent antigen receptors and the MHC. These features are found in all jawed vertebrates, including cartilaginous and bony fish, amphibians and reptiles and are most likely also found in the oldest class of jawed vertebrates, the extinct placoderms. However, with the discovery of an adaptive immune system in jawless fish based on an entirely different set of antigen receptors — the variable lymphocyte receptors — the divergence of T and B cells, and perhaps innate-like lymphocytes, goes back to the origin of all vertebrates. This Review explores how recent developments in comparative immunology have furthered our understanding of the origins and function of the adaptive immune system. Adaptive immunity arose 500 million years ago in cold-blooded vertebrates. Here, Martin Flajnik discusses how recent discoveries in fish, amphibians and reptiles have improved our understanding of the origins and functions of adaptive immune systems.

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Metadata

Authors
Flajnik, M. F.
Venue
Nature Reviews Immunology
Published
2018-03-19
Volume
18
Issue
7
Pages
438-453
ISSN
  • 1474-1733 (ISSN-L)
  • 1474-1741
OpenAlex
W2790505494
Cited by
348
References
184
FWCI
3.26
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: A cold-blooded view of adaptive immunity. https://app.cochat.ai/papers/10.1038/s41577-018-0003-9
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Flajnik, M. F. (2018). A cold-blooded view of adaptive immunity. Nature Reviews Immunology. https://doi.org/10.1038/s41577-018-0003-9

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