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metal prints antigen metal prints cell membrane metal prints dendritic cell metal prints illustration metal prints immune system metal prints lymphocyte metal prints major histocompatibility complex metal prints molecules metal prints peptide metal prints protein metal prints signal transduction metal prints t cell metal prints t cell receptor metal prints

photographs antigen photos cell membrane photos dendritic cell photos illustration photos immune system photos lymphocyte photos major histocompatibility complex photos molecules photos peptide photos protein photos signal transduction photos t cell photos t cell receptor photos

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The antigen (light green) is a peptide from a tumor cell, bacteria or virus. Dendritic cells present antigens to lymphocytes through their membrane bound MHC-molecules (violet). CD4 molecules (light blue) bind to other portions of the MHC, strengthening the interaction. After binding to the MHC-antigen complex, The T-cell receptor (blue) sends a signal cascade through an attached G-protein into the T-lymphocyte cell activating an immune response.