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Fig. 2. Injection of {alpha}-methyl-5-HT caused a significant increase in (A) the appearance of urea in the water (N=27) with no corresponding increase in (B) the appearance of NH3 (N=6) or (C) the appearance of [3H]PEG 4000 (N=8). All values are means ± 1 S.E.M.; *P<0.05, significantly different from value at t=0.