Specificity of induced immune responses. The specificity of the immune responses against the SialylTn carbohydrate antigen (a) and mAb17-1A carrier protein (b) was confirmed by depletion experiments. PS or IS, or IS depleted by incubation with Sepharose beads coupled to mAb17-1A (mAb), SialylTn–mAb17-1A, SialylTn–HSA, HSA or LeY–HSA, respectively, were measured for antibody titers against SialylTn (a) or mAb17-1A (b) by ELISA. Summarized data (geomean and scatter factor) of four Rhesus monkeys are shown. Statistics: *P < 0.05 vs. IS and **P < 0.01 vs. IS (one-tailed, paired t-test)