early proembryo stage 早期原胚阶段
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During early proembryo stage, the dorsiventrality appears in the proper of the embryo. On the ventral side, the cells are small with dense cytoplasm and few vacuoles.
原胚初期胚体出现背腹极性，腹面的细胞小，细胞质稠密，液泡较少；
Enzymic protein content decreases from the maximum at early phase of proembryo stage (20.83%) to the minimum at young embryo (4.9%).
酶蛋白的最大含量在原胚阶段初为20.83%，以后至幼胚阶段急剧减少到4.9%。
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