4C0N:
reference: The structure of a class 3 nonsymbiotic plant haemoglobin from Arabidopsis thaliana reveals a novel N-terminal helical extension., Reeder BJ, Hough MA, Acta Crystallogr D Biol Crystallogr. 2014 May;70(Pt 5):1411-8. doi:, 10.1107/S1399004714004878. Epub 2014 Apr 30. PMID: 24816109

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