2VH5:
reference: Functional intracellular antibody fragments do not require invariant intra-domain disulfide bonds., Tanaka T, Rabbitts TH, J Mol Biol. 2008 Feb 22;376(3):749-57. Epub 2007 Dec 4. PMID: 18187153

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