LM of a stage 1c embryo (zygote) in vitro, 20 hours post-insemination. Embryo is in syngamy. Pronuclei have disappeared entirely.
From: Veeck and Zaninovic´, 2003. Reproduced with permission of the publisher, Taylor & Francis Group.
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Keywords: pronucleus, stage 1c embryo, syngamy, zygote
Source: The Virtual Human Embryo.