Splenic NK cells from IκBα°ϵ° chimeras have an abnormal phenotype. (A) Expression of CD2, CD11b, CD43, and CD45R on splenic CD3^-CD122⁺DX5⁺ NK cells from WT (shaded histograms) and IκBα°ϵ° (bold line) chimeras. (B) Expression of CD117, Ly49D, and Ly49G2 on splenic CD3^-CD122⁺DX5⁺ NK cells from and IκBα°ϵ° chimeras. Percentages of positive cells are indicated.