mortality/aging
• die between E5.5 and E6.5
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embryo
• most blastocysts in culture do not normally hatch from the zona pellucida
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• by E5.5
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• blastocysts are smaller at E3.5
• at E5.5
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• smaller at E3.5
• appear condensed after 24 and 48 hours in culture
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• after 4 days in culture no expansion of the ICM is seen
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• at E3.5 increased apoptosis and reduced proliferation are seen in blastocysts
• pyknotic nuclei and apoptotic changes are seen in the embryos at E5.5
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growth/size/body
• blastocysts are smaller at E3.5
• at E5.5
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