4O6K:
reference: The crystal structure of zebrafish IL-22 reveals an evolutionary, conserved structure highly similar to that of human IL-22., Siupka P, Hamming OJ, Fretaud M, Luftalla G, Levraud JP, Hartmann R, Genes Immun. 2014 Jul-Aug;15(5):293-302. doi: 10.1038/gene.2014.18. Epub 2014 May, 15. PMID: 24833303

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