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Ahuja, E. G., Janning, P., Mentel, M., Graebsch, A., Breinbauer, R., Hiller, W., … Blankenfeldt, W. (2008). PhzA/B Catalyzes the Formation of the Tricycle in Phenazine Biosynthesis. Journal of the American Chemical Society, 130(50), 17053–17061. doi:10.1021/ja806325k 
10.1021/JA806325K