2XVX:
reference: Evolution in a family of chelatases facilitated by the introduction of active site asymmetry and protein oligomerization., Romao CV, Ladakis D, Lobo SA, Carrondo MA, Brindley AA, Deery E, Matias PM, Pickersgill RW, Saraiva LM, Warren MJ, Proc Natl Acad Sci U S A. 2010 Dec 20. PMID: 21173279

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