mortality/aging
• in crosses of heterozygous females with wild-type males heterozygous embryos are present at E10.5 but absent at E11.5; however heterozygous females are viable when wild-type females are crossed to hemizygous null males
• tetraploid rescue results in viable heterozygous females
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embryo
• at E9.5, the spongiotrophoblast is underdeveloped
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• at E10.5, the labyrinth layer is thinner and more compact, maternal erythrocytes are restricted to the maternal side of the labyrinth, and fetal erythrocytes remain in the allantois and chorion
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