<prompt> Regarding Natural Killer Cell, all are true except?It is activated by IL-2CD-56 positiveAntibody induced proliferationVariant of large lymphocyte  <response>: Natural Killer Cells or NK cells are a type of cytotoxic lymphocyte critical to the innate immune system.NK cells play is analogous to that of cytotoxic T cells in the vertebrate adaptive immune response. CD 56 and CD 16 positive.Special action against viruses and tumor cells. 