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In 2015, we discovered the sea star(asterid) IGKappa gene and a sea star primitive antibody. 2 years later, we discover an ophuirid IGKappa gene in OPHIOCOMINA NIGRA which is the first sister of the sea star: Asterias rubens . It's like a big-bang in the immuno-genomics of INVERTEBRATES.So 2 classes of Echinodermata out of five possess an IGKAPPA gene which induce a primitive antibody , a Fab fragment gene and a Fc receptor gene. We recall that the class of echinid has no lymphocytes, no IGkappa gene; the class of holothurid has no lymphocytes.Now we have a look on the last class: the crinoïd.
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