Abstract

Antedon bifida, belongs to the class of Crinoïds. It’s an ancestral ECHINODERMATA. The body is a concave disc surrounded by ten pinnately divided arms, giving it a fem-like appearance. It possesses an axial organ similar to the sea star one : a primitive immune organ. We discover in it : 1) An IGKAPPA Gene recalling the IPA (Invertebrate Primitive Antibody) 3) A Fc receptor gene witch matches with human Fc gene 4) At Last MHC genes.

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