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Amino acid alignment of GBB-1 and GBB-2 subunits with mouse GABAB1 and GABAB2 subunits. Transmembrane domains are indicated by shaded bars above the sequence, as well as the point mutations obtained in the cDNA clone of GBB-2 (circled, with mutated residue indicated below the sequence). gbb-1 is gene Y41G9A.4b, gbb-2 is gene ZK180.1, and mouse GABAB1 and GABAB2 subunits have accession numbers NM_019439.3 and NM_001081141.1, respectively. Alignment was done with ClustalX.
