CD158b⁺ is preferentially expressed on expanding NKG2C⁺ NK cells after CMV reactivation. NKG2C⁺ (○) and NKG2C⁻ (■) NK cells from recipients without CMV reactivation (A) and with CMV reactivation (B) at the indicated time points were further gated as being CD158a⁺ (top panel), CD158b⁺ (middle panel), or KIR3DL1⁺ (bottom panel). Points represent the means ± SEM. The slope of time for NKG2C⁺ NK cells was compared using a linear mixed model.