The mesophyll was undifferentiation, without chloroplasts.
叶肉不分化，细胞不含叶绿体。
2
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 ）。
3
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.