mortality/aging
• homozygous mutant embryos are usually resorbed by E11.5
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growth/size/body
• Background Sensitivity: the size and extent of development attained by mutant embryos on a congenic C57BL/6J genetic background are somewhat reduced relative to those on a mixed genetic background
• at E9.5, homozygous mutant embryos of a mixed genetic background reach the size and complexity of E8.5 wild-type embryos
• however, a variety of structures derived from ectoderm (neural plate), mesoderm (cardiac muscles, somites, red blood cells) and definitive endoderm (foregut) as well as several extraembryonic tissues (yolk sac, amnion, allantois, trophoblast) are successfully formed
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embryo
• at E7.5, homozygous mutant embryos display a small, underdeveloped ectoderm
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• although developmentally normal until E6.5, homozygous mutant embryos cease to grow and differentiate at E10.5 or thereafter
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• Background Sensitivity: the size and extent of development attained by mutant embryos on a congenic C57BL/6J genetic background are somewhat reduced relative to those on a mixed genetic background
• at E9.5, homozygous mutant embryos of a mixed genetic background reach the size and complexity of E8.5 wild-type embryos
• however, a variety of structures derived from ectoderm (neural plate), mesoderm (cardiac muscles, somites, red blood cells) and definitive endoderm (foregut) as well as several extraembryonic tissues (yolk sac, amnion, allantois, trophoblast) are successfully formed
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• at E9.5, some homozygous mutant embryos fail to exhibit somite formation
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• at E7.5, homozygous mutant embryos frequently exhibit abnormal proliferation and folding of the extraembryonic membranes
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• at E9.5, many homozygous mutant embryos display a large, spherical allantois, suggesting abnormal chorioallantoic fusion
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