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Proctolin is a neuropeptide present in insects and crustaceans. It was first found in ''Periplaneta americana'', a species of cockroach in 1975. Proctolin was extracted from 125,000 cockroaches and the Edman degradation was carried out on the sample to determine the amino acid sequence, which is Arg-Tyr-Leu-Pro-Thr. Proctolin was the first insect neuropeptide to be sequenced. Starratt and Brown identified it as a visceral muscle neurotransmitter. However, it now appears that there are many more functions of proctolin, and it is present in many more species. == Where proctolin is found == Proctolin is found in the following insect orders: * Orthoptera * Hemiptera * Lepidoptera * Diptera * Hymenoptera * Coleoptera Proctolin may also be present in molluscs, annelids, decapod crustaceans, and possibly even some mammals. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Proctolin」の詳細全文を読む スポンサード リンク
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