reproductive system
• heterozygous embryos of homozygous mothers die by E10.5
• normal male fertility
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cellular
• heterozygous progeny of homozygous females show severe placental defects
• impaired embryonic growth
• neural tube defects in embryos
• pericardial edema in embryos
• loss of some but not all maternally inherited imprinting patterns
• embryos dead by E10.5
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