High power TEM of a section of a stage 2, 7-cell embryo in vivo (original magnification x10,000). A primordial junctional complex (arrows) joins two cells near the subzonal space (*).
From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.
Keywords: primordial junctional complex, seven-cell embryo, subzonal space
Source: The Virtual Human Embryo.