4XXO: Crystal Structure Of Human Apobec3a
reference: The ssDNA Mutator APOBEC3A Is Regulated by Cooperative Dimerization., Bohn MF, Shandilya SM, Silvas TV, Nalivaika EA, Kouno T, Kelch BA, Ryder SP, Kurt-Yilmaz N, Somasundaran M, Schiffer CA, Structure. 2015 May 5;23(5):903-11. doi: 10.1016/j.str.2015.03.016. Epub 2015 Apr, 23. PMID: 25914058

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