1F3K:
reference: Three-dimensional solution structure of omega-conotoxin TxVII, an L-type calcium channel blocker., Kobayashi K, Sasaki T, Sato K, Kohno T, Biochemistry 2000 Dec 5;39(48):14761-7. PMID: 11101291

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