Active only in effector phase of cellular response, they release perforin proteins.
Active only in effector phase of cellular response, they release perforin proteins. Natural killer cells can compensate for these lymphocytes against viruses like Epstein-Barr that actively diminish the amount of (*) class I major histocompatibility complex molecules on antigen presenting cell surfaces.  Activated by interleukin-2 released from helper T cells, for 10 points— name these cell-mediated "killer" T  cells.
Active only in effector phase of cellular response, they release perforin proteins.
cytotoxic T cells (accept killer T cells before they are mentioned)