n. a *protease enzyme that is released by *cytotoxic T cells and *natural killer cells to induce death of virus-infected target cells.
n. a protein produced by *cytotoxic T cells and *natural killer cells that are in contact with virus-infected target cells. It creates pores in the target-cell membrane, which facilitates the delivery of *granzymes to the cell to induce cell death (*apoptosis).... perforin
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