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The trees Schinopsis lorentzii and S. marginata produce alk(en)ylcatechols, also known as urushiols, which function in plant defense as antifungals, antifeedants and cause contact dermatitis in human beings. Here, we propose the use of the diazonium salts Fast Blue B ½ZnCl2 and Fast Blue RR ZnCl2 for the in situ histochemical localization of urushiols in stems and leaflets of S. lorentzii and S. marginata...
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