MYOM3 and limb-girdle muscular dystrophy: MYOM3 fragments were identified to be elevated in serum of LGMD R3 α-sarcoglycan-related (LGMD2D) patients compared to controls; however, the levels of these fragments were lower in LGMD R3 α-sarcoglycan-related (LGMD2D) patients compared to DMD patients.37