Inhibitory MCH receptor repertoire of selected and unselected NK cells. (A) Inhibitory MHC receptor repertoire of donor 1 (expressing Bw4 on HLA-A but not HLA-B), showing 6% of NK cells expressing KIR3DL1 as their sole inhibitory MHC receptor. Numbers on plot are the percentages of total cells in the gate. (B) The same analysis performed on clonally expanded NK cells after depletion for KIR2DL/S1/2/3 and NKG2A and positive selection for KIR3DL1.