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Effect of morphine on Ang II-induced scratching, biting and licking responses in mice. Morphine was administered i.p. 5 min prior to injection of Ang II (3 pmol). The duration of scratching, biting and licking induced by Ang II was determined over a 25 min period starting immediately after i.t. injection. Values represent the means ± S.E.M. for groups of 10 mice. **p < 0.01 compared with Ringer controls and # p < 0.05 compared with Ang II alone.
