4MF9:
reference: Structural analysis and identification of PhuS as a heme-degrading enzyme from Pseudomonas aeruginosa., Lee MJ, Schep D, McLaughlin B, Kaufmann M, Jia Z, J Mol Biol. 2014 May 1;426(9):1936-46. doi: 10.1016/j.jmb.2014.02.013. Epub 2014 , Feb 20. PMID: 24560694

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