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Summary of fetoplacental phenotypes from syncytin KO mice
| syncytin-A KO | syncytin-B KO |
| 100% embryonic lethality (midgestation) | 20% reduced proportion of neonates (late gestation) |
| Growth retardation (early gestation) | Growth retardation (late gestation) |
| Trophoblast overexpansion | No trophoblast accumulation |
| Squeezed fetal vessels | Enlarged maternal lacunae |
| Unfused ST-I | Unfused ST-II |
