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Normalized serotonin levels in the brain of zebrafish. Note that the D1-receptor antagonist SCH23390 was found to significantly reduce serotonin levels only in the AB strain (solid bars) but not in the SF strain (striped bars). Mean ± S.E.M. are shown. Sample sizes (n) are 10 for all concentration groups in each strain. The concentration of the drug indicated below the graphs represents the external bath concentration.
