Table 1.

Mean number of cocaine infusions (0.25 mg/infusion) ± SEM in 1 hr before (baseline) and after (free cocaine) immunization

	GNC-KLH	KLH
Baseline	16.40  ± 1.60	14.62  ± 2.35
Extinction	6.12  ± 1.21	5.93  ± 0.96
Re-exposure
Day 1 (1 prime)	4.30  ± 1.01*	15.00  ± 2.14
Day 2 (1 prime)	3.90  ± 1.05*	12.20  ± 2.17
Day 3 (1 prime + 1 infusion)	15.40  ± 4.33	13.20  ± 1.43
Day 4 (1 prime + 2 infusions)	9.25  ± 3.49*	17.20  ± 1.72
Free cocaine	29.61  ± 4.31†	14.70  ± 2.63

Mean number of responses ± SEM in 1 hr before (extinction) and after (re-exposure) immunization. 

^*Significantly different from control group (KLH). 

^†Significantly different from baseline.