T-cells are mobilized when they encounter a cellsuch as a dendritic cell or B-cell that has digestedan antigen and is displaying antigen fragmentsbound to its MHC molecules. Cytokines helpthe T-cell mature. The MHC-antigencomplex activatesthe T-cell receptorand the T cellsecretes cytokines. Some cytokinesspur the growthof more T-cells. Some T-cells becomecytotoxic cells and track downcells infected with viruses. Some T-cells becomehelper cells andsecrete some cytokinesthat attract freshmacrophages,neutrophils, otherlymphocytes, and othercytokines to direct therecruits once they arriveon the scene. Infectedcells
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