Expression of Exon1 and Exon2 in olfactory bulb, frontal cortex, medial striatum, lateral striatum, hippocampus and cerebellum of adult mouse brain. Samples were examined for Exon1 and Exon2 transcripts by quantitative RT-PCR. Number of transcripts were calculated per 10000 transcripts of GAPDH. Data are presented as mean ± SEM of five individual animals. Expression of Exon1 and Exon2 in each of the investigated brain regions was evaluated by Mann–Whitney U test. # P < 0.05. Comparison of the expression of Exon1 and Exon2 between the various mouse brain regions was analyzed by one-way ANOVA followed by Tukey’s post hoc test. * P < 0.05. (CpuM) medial striatum; (CpuL) lateral striatum.