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A family of opioid receptor-like sequences exists in C. commersoni. The dendrogram shows the relationships of the partial sequences of five teleost fish opioid-like receptors to the rat μ- (11), κ- (9) and δ- (11) opioid receptors, and the rat ORL1 receptor (14); this was generated using the computer program pileup (Wisconsin Sequence Analysis Package).
