3H8T:
reference: Unique structure and stability of HmuY, a novel heme-binding protein of Porphyromonas gingivalis., Wojtowicz H, Guevara T, Tallant C, Olczak M, Sroka A, Potempa J, Sola M, Olczak T, Gomis-Ruth FX, PLoS Pathog. 2009 May;5(5):e1000419. Epub 2009 May 8. PMID: 19424422

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).