Microbiology A superantigen is a bacterial product that – A Binds to B7 and CD28 costimulatory molecules B Binds to the beta chain of TCR and MHC class II molecules of APC stimulating T cell activation C Binds to the CD4+ molecule causing T cell activation D Is presented by mactrophages to a larger-than-normal number of T helper CD4 + lumphocytes 💡 Explanation A superantigen is a bacterial product that - ✓ Correct Answer: B. Binds to the beta chain of TCR and MHC class II molecules of APC stimulating T cell activation