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The precursor of amphibian tachykinin has not been found although more than 30 tachykinins have been isolated from amphibians since 1964. In this report, two tachykinin-like peptides are identified from the skin secretions of the frog, Odorrana grahami. Their amino acid sequences are DDTEDLANKFIGLM-NH 2 (named tachykinin OG1) and DDASDRAKKFYGLM-NH 2 that is the same with ranamargarin...
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