Divergent Ionotropic Receptors (IR), members of the IR family of ligand-gated ion channels, are largely species-specific, with low amino acid sequence identity. Expressed in gustatory organs, they are believed to be taste receptors. (Adapted from FBrf0211681).
Notes on Group
FBrf0211681 (and corresponding supplementary information, FBrf0219605) lists Ir10a, Ir67a and Ir60e as pseudogenes (citing genome version 4.55). This disparity probably arises from polymorphic variants.