由于组织工程构建骨组织的需要,必须使用促进骨细胞增殖的细胞因子BMP,请选择你认为最合适的材料和工艺,设计一个BMP的控制释放体系,其要求如下:1.做成包囊型的微囊:2.粒径小于250μm3.BMP

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