5HGR:
reference: Different Functions of the Paralogs to the N-Terminal Domain of the Orange Carotenoid Protein in the Cyanobacterium Anabaena sp. PCC 7120., Lopez-Igual R, Wilson A, Leverenz RL, Melnicki MR, Bourcier de Carbon C, Sutter M, Turmo A, Perreau F, Kerfeld CA, Kirilovsky D, Plant Physiol. 2016 Jul;171(3):1852-66. doi: 10.1104/pp.16.00502. Epub 2016 May, 13. PMID: 27208286

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