Sharks and skates represent the earliest vertebrates with an adaptive immune system based on lymphocyte antigen receptors generated by V(D)J recombination. Shark B cells express two classical immunoglobulins (Ig), IgM and IgW, encoded by an early, alternative gene organization consisting of numerous autonomous miniloci, where the individual gene cluster carries a few rearranging gene segments and one constant region, μ or ω. We have characterized eight distinct Ig miniloci encoding the nurse shark omega heavy…
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