1NGK:
reference: A TyrCD1/TrpG8 hydrogen bond network and a TyrB10TyrCD1 covalent link shape the heme distal site of Mycobacterium tuberculosis hemoglobin O., Milani M, Savard PY, Ouellet H, Ascenzi P, Guertin M, Bolognesi M, Proc Natl Acad Sci U S A 2003 May 13;100(10):5766-71. Epub 2003 Apr 28. PMID: 12719529

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