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It was previously demonstrated that a fungus producing communesin alkaloids, subsequently identified as Penicillium marinum, could also accept 6-fluoro analogues of tryptophan or tryptamine to form mono-fluoro-communesin analogues in addition to communesins. A strategy to increase the relative yield of analogues by mutation to impair decarboxylation of tryptophan has been studied. Four mutants with...
In this study, we have mapped the immunoreactivity and the binding sites for bufokinin, a tachykinin peptide from the toad intestine. Dense bufokinin-immunoreactive fibers were present at the myenteric plexus, but no cell bodies were stained, suggesting an extrinsic origin. Bufokinin nerve fibers were also associated with submucosal blood vessels and mesenteric arteries. Autoradiographic binding sites...
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