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超抗原 (ｓｕｐｅｒａｎｔｉｇｅｎ ,ＳＡｇ)是一组具有强大刺激能力的细菌外毒素或逆转录病毒 ,其无需抗原提呈细胞 (ａｎｔｉｇｅｎｐｒｅｓｅｎｔｉｎｇｃｅｌｌｓ ,ＡＰＣ)内处理加工 ,能直接与ＡＰＣ膜上的ＭＨＣ ＩＩ类分子抗原结合槽外侧非限制性结合 ,以完整的蛋白质分
Superantigen (SAg) is a group of bacterial exotoxins or retroviruses with strong stimulating ability that does not require processing in antigenpresenting cells (APC) and can directly interact with MHC class II antigen Binding to the lateral non-restricted binding to complete protein fractions