Figure 4

PSA⁺ cells are functional NK cells. (A) PSA expression on cells isolated via PSA or CD56. (B) NK cells isolated either via CD56 or PSA were assessed for their ability to lyse K562 target cells in a 4 h-killing assay. Data shown are the average mean ± SEM from one out of three independent experiments. (C) Comparison of killing efficiencies at the effector target ratio 50:1. Data shown are the average mean ± SEM from three independent experiments (p < 0.001). Control refers to the vitality of the K562 cell line alone.