1CQD:
reference: The 2.1 A structure of a cysteine protease with proline specificity from ginger rhizome, Zingiber officinale., Choi KH, Laursen RA, Allen KN, Biochemistry 1999 Sep 7;38(36):11624-33. PMID: 10512617

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