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Official Full Name: CD1b molecule<br />Also known as: R1; CD1; CD1A<br />This gene encodes a member of the CD1 family of transmembrane glycoproteins that are structurally related to major histocompatibility complex (MHC) proteins and form heterodimers with β-2 microglobulin. The CD1 protein mediates the self or microbial origin of major lipid and glycolipid antigens to T cells. The human genome contains five CD1 family genes, which are arranged on chromosome 1. CD1 family members are thought to differ in their cellular localization and specificity for specific lipid ligands. The protein encoded by this gene localizes to late endosomes and lysosomes via a tyrosine motif in the cytoplasmic tail and requires vesicle acidification to bind lipid antigens.