CD38 and Miyoshi myopathy: While ISB 1442 induced a selective phagocytosis of only CD38+ MM cells, hu5F9 induced similar phagocytosis of both CD38+ and CD38-KO tumor cells (Supplementary movies 3 and 4 and Supplementary Fig. 7A, B), supporting the selectivity of ISB 1442 towards CD38-expressing tumor cells.