We only investigated 7 kb (the sum of the upper region from exon 1a, the full region from exon 1a to exon 3, all coding region from exon 4 to exon 9 and the part of intron 3 and 30 UTR) out of 230 kb for the full GABRB3 gene, and more mutations could be present in the other residues ofGABRB3.