1B6Z:
reference: Crystallographic and kinetic investigations on the mechanism of 6-pyruvoyl tetrahydropterin synthase., Ploom T, Thony B, Yim J, Lee S, Nar H, Leimbacher W, Richardson J, Huber R, Auerbach G, J Mol Biol 1999 Feb 26;286(3):851-60. PMID: 10024455

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