embryo
• in two E9.5 chimeric embryos with >95% mutant cells, discernable somites are absent and the somitic region is cell-deficient
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cardiovascular system
• n two E9.5 chimeric embryos with >95% mutant cells, the dorsal aortae become dilated to fill the space created by the complete loss of identifiable somites
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skeleton
• in chimeric embryos, mutant cells are unable to contribute to (i) the sclerotomal compartment of somites that gives rise to the axial skeleton at E8.5 and E9.5 and (ii) the developing ribs at E14.5 and E16.5
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