5TKM:
reference: Structural determinants of APOBEC3B non-catalytic domain for molecular assembly and catalytic regulation., Xiao X, Yang H, Arutiunian V, Fang Y, Besse G, Morimoto C, Zirkle B, Chen XS, Nucleic Acids Res. 2017 Jul 7;45(12):7494-7506. doi: 10.1093/nar/gkx362. PMID: 28575276

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