(A–C) The frequency of (A) Ly49H NK cells among lymphocytes, (B) Ly49H NK cells among lymphocytes (excluding CC mice lacking Ly49H, ordered from least to greatest, and (C) Ly49H+ among NK cells (among those boxed in B, ordered from least to greatest) in the PBLs of B6, BALB/c, and CC mice. (D) Ly49H geometric mean fluorescence intensity (GMFI) by Ly49H+ NK cells (among those boxed in C, ordered from least to greatest). Data are from one to three individual experiments with 1–20 mice per group. Error bars represent SEM.