LAMP1 and Miyoshi myopathy: Figures 3A, B show that NK cells significantly induced apoptosis of RPMI8226 and MM.1S cells. The killing activity of exNK cells and NKL cells to the two MM cell lines increased by about 30% and 20%, respectively, compared to the control group. The surface translocation assay of CD107a was used to determine the degranulation activity of NK cells (Figures 3C, D).