目的：探讨凋亡在软骨细胞分化中的作用。
Objective to explore the effect of apoptosis on chondrocyte differentiation.
随着增殖层细胞逐渐向肥大层软骨细胞分化，软骨厚度逐渐增加。
With the development of articular, the proliferation cells differentiated into hypertrophic cells, and the cartilage thickened.
目的：探讨人脐带血间充质干细胞存在及体外向成软骨细胞分化的可能性。
Objective To explore whether mesenchymal stem cells could be isolated from human umbilical cord blood and would be able to differentiate into chondroblast in vitro.
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