舒尔策氏双胎形成 Schultze′s double formation
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将两栖类的胚胎于第一卵裂前后上下倒转原样放置一定时间，则常可产生两个原口而形成两个胚体。其原因认为是由于倒转而使卵内容物移动所致。此现象为舒尔策（O.Schultze）于1894年发现。
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