Very high TEM of a hatched stage 3 embryo in vitro showing details of an apparently elongating mitochondrion within an inner cell mass (embryoblast) cell (original magnification x52,500).
From: Sathananthan and Trounson, 2000
Keywords: elongating mitochondrion, hatched embryo, inner cell mass (embryoblast) cell
Source: The Virtual Human Embryo.