Automated description from the Alliance of Genome Resources (Release 7.0.0)
Enables IgM binding activity. Involved in humoral immune response mediated by circulating immunoglobulin; immunoglobulin transcytosis in epithelial cells; and regulation of B cell receptor signaling pathway. Acts upstream of or within negative regulation of extrinsic apoptotic signaling pathway and negative regulation of lymphocyte apoptotic process. Located in external side of plasma membrane and trans-Golgi network membrane. Orthologous to human FCMR (Fc mu receptor).