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“8 Pretreatment with 10−5 m methylene blue produced a significant reduction of the ACh‐ and SNP‐induced relaxations in the precontracted venous segments with and without endothelium.”
British journal of pharmacology • 1993 | View Paper
“Rose bengal in formic acid solution, and methylene blue or rose bengal in aqueous acetic acid solution sensitized a selective oxidation of methionine , which was quantitatively converted to methionine sulphoxide.”
“During the photochemical action of methylene blue on tyrosine, tryptophan, and methionine , intermediary oxidizing agents were formed; in methionine this was shown to be H 2 O 2 .”