Receptors for the Fc fragment of IgG, or FCGRs (see MIM 146790), are cell surface glycoproteins of the Ig superfamily (IgSF). These receptors mediate phagocytosis of IgG-coated pathogens and promote activation of effector cells, leading to inflammatory responses and antibody-mediated cellular cytotoxicity. All FCGR genes map to human chromosome 1. Additional genes in this region, including FREB, encode FCGR homologs that are selectively expressed in B cells and may be implicated in B-cell development and lymphomagenesis.
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Fc receptor homolog expressed in B cells (FREB); Fc receptor homolog expressed in B-cells; Fc receptor related protein X; Fc receptor-like A; Fc receptor-like and mucin-like 1; Fc receptor-like and mucin-like protein 1; Fc receptor-like protein; Fc receptor-related protein X; FCRL; FCRL1; FCRLb; FCRLc1; FCRLc2; FCRLd; FCRLe; FCRLM1; FCRLX; FCRX; FREB