CD79A and Miyoshi myopathy: Mononuclear cells were isolated from bone marrow aspiration of 8 cases that presented with diagnosed MM (patient 1, 2, 5, 6, 7: IgG-λ subtype; patient 3: non-secretory myeloma; patient 4: IgA-λ subtype; patient 8: IgG-κ subtype).