Talk:Blastomere

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"About 90 minutes after fertilization, the zygote divides into two cells." - With what reference? According to Biology by Campbell & Reece (sixth edition) does the first division of the human zygote complete 36 hours after fertilization, followed by the second at 60 hours and third by 72 hours. Zewz (talk) 11:05, 20 March 2010 (UTC)