tail fold

caudal tail fold or cervical skin fold

尾部皮肤和颈部皮肤皱折

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The authors discussion the staging parameters of embryonic development, the forming of gastrulation, "ammon tail fold" and "posterior amnion tube" and the forward movement of the embryo itself.

并就乌龟发育分期的标准，原肠胚的形成，羊膜尾褶和后羊膜管，早期胚胎的自身运动等问题进行了讨论。

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