mortality/aging
• no viable embryos obtained after E9.5
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cardiovascular system
• absence of smaller segmental vessel branches between somites
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• absence of smaller segmental vessel branches between somites
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• enlarged extraembryonic blood vessels filled with large numbers of erythrocytes in the yolk sac at E9.5
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• severely retarded development of the heart, with morphology corresponding at E9.5 to an E7.5-E8 stage embryo
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• enlarged pericardial sacs that occasionally expanded to extreme sizes at E9.5
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embryo
• enlarged extraembryonic blood vessels filled with large numbers of erythrocytes in the yolk sac at E9.5
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• reduced first branchial arch
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• reach about 2/3 of the size of wild-type, with the body region distal to the forelimb buds most growth retarded
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• caudal most somite was followed by a protruding bulge of paraxial mesoderm, corresponding to fused somites
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• fusing neural tubes had irregularly shaped lateral neuroepithelial walls
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• only the rostral four or five pairs of somites appeared normal although they were irregular in size and less well delineated
• caudal most somite was followed by a protruding bulge of paraxial mesoderm, corresponding to fused somites
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• had extracorporal mesenchymal swellings at the insertion of the umbilical cord
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• yolk sacs had enlarged extraembryonic blood vessels filled with large numbers of embryonic erythrocytes and their progenitors
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growth/size/body
• reach about 2/3 of the size of wild-type, with the body region distal to the forelimb buds most growth retarded
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nervous system
• fusing neural tubes had irregularly shaped lateral neuroepithelial walls
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• foreshortened forebrain anlage at E9.5
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• had an abnormal hindbrain flexure at E9.5
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craniofacial
• reduced first branchial arch
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