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Peak heart rate and plasma cocaine levels in Week 3 (open bar) and Week 13 (filled bar) as a function of cocaine dose in High and Low AB groups. Vertical bars indicate standard error (SEM). Asterisks indicate a significant difference between Week 3 and Week 13 (* p < 0.05). Note that the GEE analysis of the effect of antibody levels on plasma cocaine levels did not achieve significance (p=0.16).
