SEM of a stage 4 embryo in vitro (left) attached to a monolayer culture of endometrial epithelial cells (E). Notice the bulging mural trophoblast cells.
From: Lindenberg, 1991. Reproduced with permission of the publisher, Elsevier.
Keywords: endometrial epithelial cell, mural trophoblast cell, stage 4 embryo
Source: The Virtual Human Embryo.