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Dose-dependent effects of tryptamines alone and in combination when administered in a water vehicle. (a) Psilocybin caused significant increases in the number of head twitches at 0.2, 1.0, and 2.0 mg/kg. (b) Norbaeocystin did not increase the number of head twitches at any dose studied. Note: *p < 0.05; **p < 0.01.
