Effect of miR-490-5p on proliferation and apoptosis of p815 mast cells. A: Effect of miR-490-5p on proliferation of p815 mast cells, cell viability in the siRNA group was significantly reduced compared to the normal and null group (P < 0.05), there was no significant difference between the normal and null group; B: Mast cell apoptosis after transfection, in the normal group the mean apoptotic index was 15.86%, in the siRNA group the mean apoptotic index was 41.19%, in the null group the mean apoptotic index was 11.84% (n = 3).