5AX2:
reference: Hyperbolic Pressure-Temperature Phase Diagram of the Zinc-Finger Protein apoKti11 Detected by NMR Spectroscopy., Klamt A, Nagarathinam K, Tanabe M, Kumar A, Balbach J, J Phys Chem B. 2019 Jan 31;123(4):792-801. doi: 10.1021/acs.jpcb.8b11019. Epub, 2019 Jan 16. PMID: 30608169

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