The outer membrane (chorion) and trophoblast layer of the ... The proliferating cytotrophoblast cells provide, after differentiation, the villous syncytiotrophoblasts as the outer cellular layer ...

epiblast cells, which become the embryo proper (or foetus) trophoblast cells, which become the placenta hypoblast cells, which become the supportive yolk sac extraembryonic mesoderm cells A total ...

[16,18–20] The uNK cells are immunomodulatory but noncytotoxic in nature and, together with macrophages, have been suggested to be crucial for regulating trophoblast invasion and spiral artery ...