初期发生 early development

互联网2013-11-14

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　　或称为早期发生，主要是指多细胞动物的个体发生从受精开始到胚胎形成为止的这一时期而言。在经过受精、卵裂、囊胚的形成，继续在显著的形态形成活动的原肠期或与其相当的阶段而分出胚层，产生器宫原基，开始组织分化和生长。

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