mortality/aging
• mice begin to die at E6 and all but one mouse die by E13.5
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• mice begin to die at E6
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embryo
• mice do not develop beyond E5
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• in culture, blastocysts produce abnormal outgrowths with defective or no inner cell mass derivatives
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• blastocysts fail to form an inner cell mass in culture
• however, cell proliferation in culture is normal
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