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Time line for optimal development

Time line for optimal in vitro development of stage 2 (morula) and stage 3 (blastocyst) embryos. A two-cell stage 2 embryo forms between 24 and 26 hours. A hatched stage 3 embryo forms at 144 hours.

D = days
h = hours

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

Keywords: blastocyst(s), hatched embryo, morula, two-cell embryo

Source: The Virtual Human Embryo.