TABLE 1.

Experiment 1 treatment groups

Group	Vaccine	Pretreatment	Heroin Dose
			mg/kg
1	M-KLH	Saline	0.26
2	M-KLH	0.1 mg/kg naloxone	0.26
3	M-KLH	0.1 mg/kg naloxone	2.6
4	KLH	Saline	0.26
5	KLH	0.1 mg/kg naloxone	0.26
6	KLH	0.1 mg/kg naloxone	2.6