1TE4:
reference: MTH187 from Methanobacterium thermoautotrophicum has three HEAT-like Repeats., Julien O, Gignac I, Hutton A, Yee A, Arrowsmith CH, Gagne SM, J Biomol NMR. 2006 Jun;35(2):149-54. Epub 2006 May 31. PMID: 16819590

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