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(a) Profiles of mean [DA]o± SEM versus time, evoked by 2 single pulse stimulations, separated by 4 s. There was no significant difference in normalised [DA]o evoked by a second pulse between genotypes, at either age, in either region (CPu only shown)(n = 15–40). (b) Mean peak [DA]o±SEM evoked by second stimulus pulse, normalised to peak [DA]o evoked by first stimulus pulse.
