NK cells. Peripheral blood NK cell analysis. NK cells in the peripheral blood were analyzed by flow cytometry at days 28, 100, 180, and 365 after transplant. (A) Representative gating strategy to identify CD3⁻CD56⁺ NK cells, separated into cytotoxic CD16⁺CD56^dim and CD16⁻CD56^bright NK cells. Representative examples shown for 1 patient each in the SOC and PTCy+Aba groups at day 180 after transplant. (B) Comparison of total NK cells, CD16⁺CD56^dim and CD16⁻CD56^bright NK cells in the SOC and PTCy+Aba treatment groups across time points.