4Y6C:
reference: A Naturally Occurring Repeat Protein with High Internal Sequence Identity Defines a New Class of TPR-like Proteins., Marold JD, Kavran JM, Bowman GD, Barrick D, Structure. 2015 Oct 1. pii: S0969-2126(15)00369-X. doi:, 10.1016/j.str.2015.07.022. PMID: 26439765

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