cellular
• mutant cells presented a defect in cell cycle re-entry from quiescence, especially when stimulated with lower concentrations of serum
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mortality/aging
• mice died in utero at embryonic day 10.5
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embryo
• severe developmental retardation of mutant embryos
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• underdeveloped placental labyrinth layer
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growth/size/body
• severe developmental retardation of mutant embryos
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