Very high power SEM of the inner cell mass (embryoblast) of a stage 3 embryo in vitro (original magnification x12,000).
Notice the homogeneity of cell size in this expanded blastocyst.
From: Ménézo et al., 1999. Reproduced with permission of the publisher, Cambridge University Press.
Keywords: blastocyst(s), inner cell mass (embryoblast)
Source: The Virtual Human Embryo.