T-cell receptor-MHC-antigen complexes 插畫檔

Computer illustration of T-cell receptors (purple) binding to MHC-antigen complexes (orange and green). The antigen (light green) is a peptide from a tumour cell, bacteria or virus. A number of cells present antigens to lymphocytes via membrane bound major histocompatibility complex (MHC) molecules (orange). After binding to the MHC-antigen complex, the T-cell receptor sends a signal cascade into the T-lymphocyte cell (top) that activates an immune response.