We selected for study a set of six GABRs: GABRA1, GABRA4, GABRB1, GABRB3, GABRD and GABRE. Promoters were extracted for each gene, including two alternative first exons of the GABRB3 (37), giving a set of seven promoters. The length of each promoter was: GABRA1, 3733 bp; GABRA4, 1546 bp; GABRB1, 1353 bp; GABRB3 (exon 1), 1310 bp; GABRB3 (exon 1A), 2080 bp; GABRD, 6625 bp; and GABRE, 5278 bp. We augmented the input set with orthologous promoters from rat, with the exception of GABRB3 for which an orthologous gene from mouse was used. In total, 14 promoters upstream of six GABRs were selected for analysis.