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Fig. 2. Multiple alignment of the Callinectes sapidus {alpha}-subunit amino acid sequence with examples from other arthropods (Drosophila melanogaster and two isoforms from Artemia franciscana) and from vertebrates (Torpedo californica, Anguilla anguilla, Xenopus laevis, Gallus gallus and Homo sapiens). Alignment was produced using ClustalW and GeneDoc software. Blue, 100 % agreement; green, 80 %; yellow, 60 %. Putative transmembrane domains are indicated by solid black lines; the likely ATP binding site is indicated by a solid red line (Horisberger et al., 1991).