 They do have numerous granules which provide their ability to kill cells and these granules are why NK cells have an alternate name, LGL, Large Granular Lymphocytes.NK cells not only have a catchy movie-title name (Natural Killer) but are also the only lymphocytes considered part of the innate immune system (in contrast to the adaptive immune system.Yet they are much more closely related to T cells (part of the adaptive immune system) than to other cells of the innate immune system.