1AD7:
reference: Three-dimensional structure of a gamma-carboxyglutamic acid-containing conotoxin, conantokin G, from the marine snail Conus geographus: the metal-free conformer., Rigby AC, Baleja JD, Furie BC, Furie B, Biochemistry 1997 Jun 10;36(23):6906-14. PMID: 9188685

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