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Chemoreception is mediated in Caenorhabditis elegans by membersof the seven-transmembrane G-protein-coupled receptor class (7TM GPCRs) of proteins which are of the serpentine type [1]. Srj is part of the Str superfamily of chemoreceptors. The srj family is designated as the out-group based on its location in preliminary phylogenetic analyses of the entire superfamily [2]. Chemoperception is one of the central senses of soil nematodes like C. elegans which are otherwise 'blind' and 'deaf' [3].
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