GPRC5D and Miyoshi myopathy: Multiple potential targets in MM have been identified including the B-cell maturation antigen (BCMA; a tumor necrosis factor receptor superfamily member 17 surface protein found predominantly on mature B-lymphocytes and plasma cells but not in other normal cells), CD24, CD38, CD56, CD138, signaling lymphocytic activation molecule family member 7 (SLAMF7), programmed death-ligand 1 (PD-L1), G protein-coupled receptor class C group 5 member D (GPRC5D), and integrin beta7.