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Secondary structure of hASBT and TM2 sequence alignment among species. A, schematic diagram of the secondary structure of hASBT based on a 7TM topology previously proposed. In this model TM2 ranges from residue Leu73 to Val98. B, sequence of TM2 of hASBT was aligned with SLC10A2 of 10 other species, including sequence of ASBTNM to elucidate the sequence conservation.
