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A蛋白(Protein A简称SPA)产生于金黄色葡萄球菌细胞壁,它能和数种哺乳类IgG的Fc段高度特异性亲和,是藉助于两个结合点与IgG相结合。由于A蛋白能
Protein A (SPA), produced in the S. aureus cell wall, is highly specific for the Fc portion of several mammalian IgGs and binds to IgG via two binding sites. Because Protein A can