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    Methylene blue but not indigo carmine causes DNA damage to colonocytes in vitro and in vivo at concentrations used in clinical chromoendoscopy. Davies J,Burke D,Olliver J R,Hardie L J,Wild C P,Routledge M N Gut 10.1136/gut.2006.107300
    EUS-Guided Methylene Blue Injection to Facilitate Pancreatic Duct Access After Unsuccessful ERCP. Elmunzer B Joseph,Piraka Cyrus R Gastroenterology 10.1053/j.gastro.2016.08.056