IL-7 prevented spontaneous apoptosis of the tumor T-cell line Pno.

The staining of gated lymphocytes was done at various times of cell cultures, in complete medium with or without cytokines, and with annexin V (abscissa) and propidium iodide (PI) (ordinate). The percentage of apoptotic (annexin V⁺/PI⁻) and necrotic (annexin V⁺/PI⁺) cells are indicated in the corresponding square.