LIF and chronic endometritis: Figure 2 shows a normal hysteroscopic aspect of the endometrium and certain abnormalities identified during hysteroscopy in some of the study participants. Also, the KIR AA group included a significantly higher percent of patients with chronic endometritis (p = 0.002) and had no statistically significant (p = 0.122) lower levels (both mean and median concentration) of LIF in the endometrium washing fluid as compared to KIR AB and BB group.