Fig. 6. Very high power TEM of a stage 1a embryo in vitro showing the sperm midpiece mitochondria within the ooplasm, 3 hours post-insemination (original magnification x35,700). The sperm mitochondria have abundant inner membranes or cristae with a lucent matrix that are still associated with the axoneme.
N, sperm nuclear envelope; S, smooth endoplasmic reticulum.
(From: Sathananthan and Trounson, 2000. Reproduced with permission of the publisher, Oxford University Press.)
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