A natural killer cell that is developmentally mature and expresses a variety of inhibitory and activating receptors that recognize MHC class I and other stress related molecules. [ http://www.ncbi.nlm.nih.gov/pubmed/14685782 GOC:add http://purl.obolibrary.org/obo/go/references/0000031 https://www.worldcat.org/search?q=bn%3A0781735149 ]