3EX9:
reference: PhzA/B catalyzes the formation of the tricycle in phenazine biosynthesis., Ahuja EG, Janning P, Mentel M, Graebsch A, Breinbauer R, Hiller W, Costisella B, Thomashow LS, Mavrodi DV, Blankenfeldt W, J Am Chem Soc. 2008 Dec 17;130(50):17053-61. PMID: 19053436

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