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| Description: 1. A dendritic cell engulfs a virus-infected cell. Digested fragments of the virus bind to MHC markers, and the complexes become displayed at the dendritic cell’s surface. The dendritic cell, now an antigen-presenting cell, migrates to a lymph node. Receptors on a naive cytotoxic T cell bind to the antigen–MHC complexes on the surface of the dendritic cell. The interaction activates the cytotoxic T cell.Receptors on a naive helper T cell bind to antigen–MHC complexes on the dendritic cell. The interaction activates the helper T cell, which then begins to divide. 2. A large population of descendant cells forms. Each cell has T cell receptors that recognize the same antigen. The cells differentiate into effector and memory cells. 3. The effector helper T cells begin to secrete cytokines. 4. The activated cytotoxic T cell recognizes these cytokines as a signal to divide. 5. A large population of descendant cells forms. Each cell bears T cell receptors that recognize the same antigen. The cells differentiate into effector and memory cytotoxic T cells. 6. The new effector cytotoxic T cells circulate throughout the body. They recognize and kill any body cell that displays the viral antigen–MHC complexes on its surface. Picture Stats: Views: 161 Filesize: 390.8kB Height: 1037 Width: 1426 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47533 |