About SUPERANTIGENS true is

Super antigens are molecules that can interact with antigen-presenting cells (APCs) and T-lymphocytes in a non-specific manner.  These antigens do not involve the endocytic processing as required in typical antigen presentation.  Interaction of superantigens with MHC class II molecules of the APC and the V~ domain of the T-lymphocytes receptor activates a large number of T-lymphocytes than conventional antigens.  This leads to massive cytokine expression and immuno-modulation. Staphylococcal enterotoxins, exfoliative toxin and some viral proteins are examples of superantigens. Ref : textbook of microbiology, C P Baveja 5th edition pg no:95