Table 6

Effects in phase 2 of the formalin test of naltrexone pretreatment on the antinociceptive effect of ABT-594 (n = 4–12/group)

Group	Responses^6-a
sal/sal	32.7 ± 7.1
ntx/sal	54.0 ± 9.9
sal/ABT-594	6.4 ± 4.0*
ntx/ABT-594	4.8 ± 3.4*

↵6-a Values are mean ± S.E.M.
* P < .05 vs. sal/sal.