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Effect of encapsulation of OVA in liposomes with or without IL-2 on tumor-protective immunity indicated by mean tumor volumes (a) and survival (b) of mice. Mice were challenged with E.G7-OVA cells after immunization to: □ -PBS, ◊ -OVA alone, ▲ -OVA/liposomes, ■ -OVA/IL-2 liposomes ◆ -EG7.OVA cells
