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Without syncytin, mice developed deformed placentas, and their embryos died.
没有合胞体蛋白，老鼠的胎盘畸形生长，胚胎死亡。
Syncytin started as a surface protein on retroviruses that fused them to cells.
合胞体蛋白开始作为一种逆转录病毒表面蛋白，帮助病毒和细胞融合。
But the syncytin genes we use today may have actually replaced an ancestral one that a virus bequeathed to the very first placental mammals.
但我们今天使用的合胞体蛋白基因可能实际上已取代了最初病毒传给第一个胎生哺乳动物的基因。
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