Fig. 6
From: Active immunization with human interleukin-15 induces neutralizing antibodies in non-human primates
Effect of sera from Alum group on IL-2-dependent proliferative activity in CTLL-2 cells. Cells were cultured in presence of IL-2, IL-2 plus serial dilutions of sera (starting dilution 1:25), IL-2 plus serial dilutions of an anti-human IL-2 Ab or medium. Cell proliferation was evaluated by MTT staining. All tested sera correspond to 15 days after the third immunization