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. Author manuscript; available in PMC: 2011 Apr 4.
Published in final edited form as: Eur J Pharmacol. 2006 Feb 17;534(1-3):89–94. doi: 10.1016/j.ejphar.2006.01.011

Fig. 2.

Fig. 2

Effect of naltrexone pretreatment on the antinociceptive effect of remifentanil following systemic (A) or spinal (B) administration in amphibians. Systemic administration of saline (filled bars) or naltrexone (100 nmol/g s.c., hatched bars) was given 60 min before systemic or spinal administration of remifentanil (doses given on plot). Data are plotted as the mean MPE+S.E.M. for six animals per treatment group. Asterisks (*) denote significant difference from saline-pretreated groups (P<0.05, Student’s t-test).