英语语法分析

The mesophyll was undifferentiation, without chloroplasts.

叶肉不分化，细胞不含叶绿体。

The PNI positive rate were significantly higher in the undifferentiation, vascular infiltration and lymphatic metastasis patients than those of others (P<0.05).

神经束膜浸润阳性率在未分化肿瘤、血管浸润、淋巴结转移的患者中明显增高（P< 0 .0 5 ）。

Among 0%, 2.5%, 5% and 10% groups, 2.5% FBS had profit on spermatogonial cells to grow and form more cell colonies, and profited to keep their undifferentiation state.

和10%四组中，2.5%血清有利于精原细胞生长并形成较多的集落，同时有利于维持精原细胞的未分化状态。