NK-cell subfamily analysis and radiation sensitivity. (A) Bone marrow from NOD mice (□) and age-matched B10.BR controls (BR; ▦) was stained for the various subfamilies of NK cells (5E6, 2B4) and pan-NK (DX5, NK1.1) markers as well as NK/T cells (DX5⁺/αβTCR⁺) and the relative frequency of the populations was enumerated by flow cytometry. A minimum of 5 animals was analyzed per group. Values represent mean ± SD of positive cells in the lymphoid gate. (B) Radiation sensitivity of NK cells from NOD marrow (⋄) compared with B10.BR controls (▪). Error bars indicate ± SD of averages.