CD107a expression on rIL-2–activated NK-cell subsets on stimulation with K562. (A) Flow cytometric profiles of CD107a expression on Siglec-7+/CD56+ (green), Siglec-7−/CD56+ (blue), and Siglec-7−/CD56− (red) rIL-2–activated NK-cell subsets from a representative example for a healthy donor (top line), an early (middle line), and a chronic (bottom line) HIV-1–infected patient. (B) The fraction of CD107+ NK-cell subsets is presented as a mean of 5 independent experiments (with P values and bars indicating SDs) performed with cells from 5 unrelated healthy donors, 5 unrelated HIV-1 early-infected persons, and LTNPs.