NCAM1 and endometriosis: We found statistically significant relations of decreased CD56+ NK cell counts in endometriosis placentas with odds for immature villous ramification (OR [95% CI] = 0.88 [0.72–0.97], p = 0.004), lower grade villitis of unknown etiology (VUE, OR [95% CI] = 0.87 [0.63–0.99], p = 0.031), intervillous thrombosis (OR [95% CI] = 0.95 [0.91–0.99], p = 0.015) and increased deposition of perivillous fibrin (OR [95% CI] = 0.94 [0.85–0.98], p = 0.048) compared to other groups, as shown in Figure 3a–d.