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Homologues of almost all mammalian Ig-like immunoregulatory receptor families have been found in the chicken, except the Fc receptor (FcR) family. In addition to classical FcRs that specifically bind antibodies and mediate their effector functions, this family includes “Fc receptor-like” (FCRL) proteins for which ligands have yet to be identified. We have cloned and expressed a full-length chicken...