Fig. 1. Alignment of olfactory receptors from Xenopus leavis. Alignment of the deduced amino acid sequences for ten olfactory receptors from Xenopus laevis. Identical amino acid residues are highlighted in black, residues present in >80% of the sequences are highlighted in dark grey, those with >60% conservation in light grey. Putative transmembrane domains (TM) are highlighted by black bars, and extracellular domains (EC) and intracellular domains (IC) are indicated. The putative N-linked glycosylation site is marked by an arrowhead. Additional class-specific amino acids within the amino acid chain are highlighted by asterisks. Class I receptors: XB107, 239, 238, 242; class II receptors: XB178, 180, 177, 350, 352 and 154.