1YK4:
reference: Ultrahigh-resolution study on Pyrococcus abyssi rubredoxin. I. 0.69 A X-ray structure of mutant W4L/R5S., Bonisch H, Schmidt CL, Bianco P, Ladenstein R, Acta Crystallogr D Biol Crystallogr. 2005 Jul;61(Pt 7):990-1004. Epub 2005, Jun 24. PMID: 15983423

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