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Beginning of the first cleavage

LM of a late stage 1c embryo in vitro at the beginning of the first cleavage, approximately 22 hours post-insemination age. Nuclei have not yet formed.

From: Veeck and Zaninovic´, 2003. Reproduced with permission of the publisher, Taylor & Francis Group.

Keywords: cleavage, first cleavage, nucleus, stage 1c embryo, zygote

Source: The Virtual Human Embryo.