Light micrograph of a stage 3 embryo in vitro before hatching. Notice the dense and compact inner cell mass (embryoblast) in this expanded blastocyst.
From: Ménézo et al., 1999. Reproduced with permission of the publisher, Cambridge University Press.
Keywords: dense and compact inner cell mass (embryoblast), embryo before hatching, expanded blastocyst, inner cell mass (embryoblast)
Source: The Virtual Human Embryo.