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Embryo attached to an endometrial cell culture

Low power SEM of a stage 4 embryo in vitro. Measuring bar = 550 µm. Blastocyst (curved arrow) attached to a bulging area of the endometrial cell culture. Bulging areas of the endometrial surface (straight arrows) exhibit pinopodes (protruding naked surface with many foldings).

From: Bentin-Ley et al., 1999. Reproduced with permission of the publisher, Oxford University Press.

Keywords: blastocyst(s), pinopode, stage 4 embryo

Source: The Virtual Human Embryo.