2PTL:
reference: Three-dimensional solution structure of an immunoglobulin light chain-binding domain of protein L. Comparison with the IgG-binding domains of protein G., Wikstrom M, Drakenberg T, Forsen S, Sjobring U, Bjorck L, Biochemistry 1994 Nov 29;33(47):14011-7. PMID: 7947810

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