Table 2. Mean±SEM plasma hormone concentrations in placebo- or morphine implanted and pair-fed rats 2 or 7 days after pellet implantation.

	2 days			7 days
	Placebo	Morphine	Pair Fed	Placebo	Morphine	Pair Fed
ACTH (pM)	8,05±4,02	22,35±11,52	20,80±5,16	49,20±18,43	34,87±3,57	59,05±15,76
CORT (nM)	128,1±94,1	1365,4±443,7* +	282,5±129,3	515,2±365,1	1622,5±937,4	1682,5±325,6
PRL (ng/ml)	6,06±2,38	4,10±1,58	6,60±2,73	5,32±1,33	7,85±3,98	17,57±3,90

^* p<0,05 morphine vs. pair fed; ⁺ p<0,05 placebo vs. morphine; n = 7/group.