MAPK3 and endometritis: The expression of apoptosis-related proteins cyto-C (Figure 1B,E p < 0.05), caspase-3 (Figure 1B,G p < 0.05), p-ERK1, and p-ERK2 (Figure 1F,G p < 0.01) were significantly increased in the endometritis group compared with the healthy group.