Fig. 17. Very high power TEM of a late stage 1b embryo in vitro, 24 hours post-insemination (original magnification x33,810). A transversely cut sperm tail (arrowhead) is evident close to a protuberence of the paternal pronucleus (MPn). Mitochondria (M) have a dense stroma, and the vesicular smooth endoplasmic reticulum (S) is dilated.
PnM, pronuclear membrane.
(From: Sathananthan and Trounson, 1985. Reproduced with permission of the publisher, John Wiley & Sons.)
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