Fig. 29. Low power TEM of a hypoblast cell of a stage 3 embryo in vitro, 145-170 hours post-insemination ( original magnification x5,000). Extruded material (asterick) is in the extracellular space and appears to form a basement membrane-like structure lining the epiblast cells.
BC, blastocystic cavity; BM, basement membrane; E, Epiblast cell.
(From: Lopata, Kohlman, and Kellow, 1982. Reproduced with permission of the publisher, John Wiley & Sons.)
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