mortality/aging
• no homozygous mutant embryos are retrieved past the blastocyst stage
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embryo
• proliferation of the pluripotent inner cell mass is impaired
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• only a few blastocysts are identified at E3.5
• upon culture, outgrowth of pluripotent inner mass cells from mutant blastocysts is not achieved
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cellular
• proliferation of the pluripotent inner cell mass is impaired
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