摘要：目的基于核酸适体和磁珠，提出一种检测肿瘤标志物血管内皮生长因子(VEGF)的比色方法。
Abstract: Objective to develop a novel colorimetric method for detecting the tumor biomarker vascular endothelial growth factor (VEGF) based on aptamer and magnetic beads.
免疫磁珠分选脐血cd 34 +细胞，接种于各培养体系，无外源性细胞因子条件下进行培养。
CD34 + cells were isolated from fresh umbilical cord blood samples with immunomagnetic beads and seeded into the models to culture ex vivo without exogenous cytokines.
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