1RFK:
reference: Structural basis for the thermostability of ferredoxin from the cyanobacterium Mastigocladus laminosus., Fish A, Danieli T, Ohad I, Nechushtai R, Livnah O, J Mol Biol. 2005 Jul 15;350(3):599-608. PMID: 15961101

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