6IR7:
reference: Specific modification at the C-terminal lysine residue of the green fluorescent protein variant, GFPuv, expressed in Escherichia coli., Nakatani T, Yasui N, Tamura I, Yamashita A, Sci Rep. 2019 Mar 18;9(1):4722. doi: 10.1038/s41598-019-41309-8. PMID: 30886277

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