Three illustrations of the genomic, protein and comparative sequence homologies of the different species of GAD.(A) The genomic structures of GAD1/GAD
/GAD2 and Drosophila Gad1. (B) Comparative protein domain structures of GAD65/GAD25/GAD67 and Drosophila Gad1. (Numbers represent approximate amino acid residues). (C) Schematic illustrating the relative homology of the protein structures of GAD67/GAD65 and Drosophila Gad1.