3K1K:
reference: Modulation of protein properties in living cells using nanobodies., Kirchhofer A, Helma J, Schmidthals K, Frauer C, Cui S, Karcher A, Pellis M, Muyldermans S, Casas-Delucchi CS, Cardoso MC, Leonhardt H, Hopfner KP, Rothbauer U, Nat Struct Mol Biol. 2010 Jan;17(1):133-8. Epub 2009 Dec 13. PMID: 20010839

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