Exogenous (b) Endogenous superantigen superantigen T H Cell H Cell TCR CTCR C C Peptide for which tCR Superantigen Superantigen Is not specific Class II mhc C Class II mHc APC APO 超抗原参与的T细胞活化的作用示意图超抗原参与的T细胞活化的作用示意图