After biotinylation B16 tumor cells were modified with GFP-SA bi-functional fusion protein and then subjected to fluorescent microscopy and FACS analysis.

• 用制备的GFP-SA双功能融合蛋白，对B16肿瘤细胞已生物素化的细胞表面进行修饰，经荧光显微镜和流式细胞仪进行修饰效率分析。