When an embryo develops, its genes lay down a body plan, starting with the most basic and most ancient features.

胚胎发育时，基因制定身体构造，从最基本、最原始的特征开始发育。

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When an embryo develops, its genes lay down a body plan, starting with the most basic and most ancient features.

胚胎发育时，基因制定身体构造，从最基本、最原始的特征开始发育。

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