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5-HTP-induced head twitches in 5-HTT mice. The 5-HT precursor 5-HTP, which increases 5-HT levels, induced fewer head twitches in 5-HTT−/− mice compared to 5-HTT+/+ mice, with no difference between 5-HTT+/− and 5-HTT+/+ mice. Data represent the means ± SEM; n = 9-16 per group. * p < 0.05 compared to 5-HTT+/+ mice.
