Superantigen SEA has great ability to active T cells, B7.1 molecules can provide the second signal for T cell activation and play a very important role during the process of antigen presenting and recognizing.

• 超抗原SEA具有强大的T细胞激活能力，而B7.；1分子可为T细胞活化提供第二信号，在抗原递呈和识别过程中具有十分重要的作用。