mortality/aging
• the expected percentage of blastocyst stage embryos are found but by E7.5 no viable homozygous embryos are present
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embryo
• in all but one cultured embryo the inner cell mass failed to proliferate and in the single exception produced only a residual mass
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cellular
• despite repeated attempts no ES cell lines could be generated
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• in all but one cultured embryo the inner cell mass failed to proliferate and in the single exception produced only a residual mass
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