1IDR:
reference: Mycobacterium tuberculosis hemoglobin N displays a protein tunnel suited for O2 diffusion to the heme., Milani M, Pesce A, Ouellet Y, Ascenzi P, Guertin M, Bolognesi M, EMBO J 2001 Aug 1;20(15):3902-9. PMID: 11483493

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