LILRB4 and Miyoshi myopathy: We further examined LILRB4 levels in several MM cell lines (LP-1, 8226, ARP-1, OPM2 and MM1.S), and revealed that LILRB4 was highly expressed in MM cells compared to the normal B cells (Fig. 1D and sFig. 1A–C), indicating that LILRB4 may play a critical role in MM development.