2QD3: Wild Type Human Ferrochelatase Crystallized With Ammonium Su
reference: A pi-Helix Switch Selective for Porphyrin Deprotonation and Product Release in Human Ferrochelatase., Medlock AE, Dailey TA, Ross TA, Dailey HA, Lanzilotta WN, J Mol Biol. 2007 Nov 2;373(4):1006-16. Epub 2007 Aug 23. PMID: 17884090

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