Sub-classification and stage differentiation are needed in the setting of treatment purposes.
治疗目的的设定需要细分类别，区别阶段；
To mimic early stage retinal development, the researchers needed to build microscopic gradients for solutions in which to bathe the stem cells to initiate specific differentiation paths.
为了模拟视网膜发育的早期阶段，研究人员需要构建出浓度梯度差异极其细微的溶液来培养细胞以使它们向不同的途径分化。
The first stage was the inflorescence differentiation.
第一阶段为花序分化期。
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