Table 2.

The amount of time that mutant mice (PACAP−/−) and their wild-type littermates/controls (PACAP+/+) spent in the morphine-paired chamber (MOR-paired) and saline-paired chamber (SAL-paired) prior to (preconditioning) and following single or repeated conditioning with morphine

Genotype/test day	SAL-paired	MOR-paired
PACAP (+/+)
Preconditioning	302±22	311 ±32
Single conditioning	193 ±16	396±32
Repeated conditioning	202±13	366±25
PACAP (−/−)
Preconditioning	301 ± 16	302±23
Single conditioning	246±24	289±27
Repeated conditioning	187 ±15	373 ±24

Data represent mean (±SEM) of seven mice per genotype