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In page Adaptive immune system:

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Naive cytotoxic T cells are activated when their T-cell receptor (TCR) strongly interacts with a peptide-bound MHC class I molecule. This affinity depends on the type and orientation of the antigen/MHC complex, and is what keeps the CTL and infected cell bound together.[1] Once activated, the CTL undergoes a process called clonal selection, in which it gains functions and divides rapidly to produce an army of "armed" effector cells. The activated CTL then travels throughout the body searching for cells that bear that unique MHC class I + peptide.[citation needed]