BORREGO, FRANCISCO ET AL: 'Recognition of human histocompatibility leukocyte antigen (HLA)-E complexed with HLA class I signal sequence-derived peptides by CD94 /NKG2 confers protection from natural killer cell-mediated lysis.', JOURNAL OF EXPERIMENTAL MEDICINE, (MARCH 2, 1998) VOL. 187, NO. 5, PP. 813-818., XP002109019