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. 2004 Nov 22;143(8):987–993. doi: 10.1038/sj.bjp.0706007

Figure 1.

Figure 1

Effect of chronic opioid treatment on antinociceptive response to [Dmt1]DALDA. Mice were treated for 7 days by twice daily injection (s.c.) with [Dmt1]DALDA (2.5 μmol kg−1); morphine (300 μmol kg−1); or saline (0.1 ml (10 g−1)). The AD50 values of [Dmt1]DALDA (s.c.) were determined by tail flick, using at least 10 animals per group.