Fig. 7 . Very high power SEM of the contact area of a stage 4 embryo in vitro. Measuring bar =15 µm. E, endometrial epithelial cell; T, trophoblast cell. several endometrial pinopodes (P) are in contact with the trophoblast surface of the blastocyst. (From: Bentin-Ley et al. 1999. Reproduced with permission of the publisher, Oxford University Press.)