| 3VX4: reference: Boundary of the Nucleotide-Binding Domain of Streptococcus ComA Based on Functional and Structural Analysis., Ishii S, Yano T, Okamoto A, Murakawa T, Hayashi H, Biochemistry. 2013 Apr 16;52(15):2545-55. doi: 10.1021/bi3017069. Epub 2013 Apr, 5. PMID: 23534432 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).