mortality/aging
• E8-8.5 embryos have an anterior-posterior axis and head folds but other embryonic structures are difficult to identify
• death occurs during somitogenesis
• no living embryos after E9.5
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embryo
• a dramatic developmental delay is seen at E9
• 5 somite pairs present at E9
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growth/size/body
• a dramatic developmental delay is seen at E9
• 5 somite pairs present at E9
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