Fig. 16. Very high power TEM of the interpronuclear zone in a stage 1b embryo in vitro, 17 hours post-insemination (original magnification x33,810). The narrow region of cytoplasm contains mitochondria (M) associated with smaller elements of the smooth endoplasmic reticulum. The mitochondria have dense stromae and few cristae.
PnM, pronuclear membrane; Pn, pronucleus.
(From: Sathananthan and Trounson, 1985. Reproduced with permission of the publisher, John Wiley & Sons.)
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