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Amino acid differences between functional Or22b receptors and Or22b1. Schematic representation of the Or22b1 protein including membrane topology and positions of the seven TM regions. The sites of amino acid substitutions found in the Innisfail 1 Or22ab (black and hatched circles) and Innisfail 2 Or22b3 (hatched circles) sequences compared with the Or22b1 sequence are indicated.
