EBV induced release of soluble Fas L by neutrophils in vitro. Neutrophils (10 × 10⁶ cells/mL) were incubated with or without EBV during 24 hours. At indicated times, cell-free supernatants were tested for the presence of Fas L. Results (pg/mL) presented in this figure represent the mean ± SD of experiments performed in triplicate on neutrophils from five different individuals. Values significantly different from unstimulated controls are indicated by asterisks (P < .05).