Fig. 1.

Pregnancy trained endometrial natural killer cells. a, b Percentage of NKG2C expression on CD56^bright endometrial natural killer (eNK) cells and the percentage of LILRB1 expression on CD56^brightNKG2C⁺ eNK cells. a Comparison of eNK cells from women with (>1) and without (0) previous pregnancies. b Comparison of eNK cells from CMV^pos (CMV+) and CMV^neg (CMV−) women, with (>1) and without (0) previous pregnancies. P-values determined with the Mann–Whitney one-tail test. c Characteristics of eNK subpopulation expansions in multigravidae samples. ND not determined