5XFU:
reference: Amino-acid composition after loop deletion drives domain swapping., Nandwani N, Surana P, Udgaonkar JB, Das R, Gosavi S, Protein Sci. 2017 Oct;26(10):1994-2002. doi: 10.1002/pro.3237. Epub 2017 Aug 30. PMID: 28710790

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