In MM-flow, we analyzed CD38+ (brightly positive)/CD138+/CD45−~+ (negative to positive)/CD19−/CD56± PCs in the panel of cytoplasmic immunoglobulin (cy-Ig) light chain expression and light chain-restricted PCs were identified as monoclonal PCs (Fig. 1A). The gene discussed is CD38; the disease is Miyoshi myopathy.