1EQK:
reference: Three-dimensional solution structure of oryzacystatin-I, a cysteine proteinase inhibitor of the rice, Oryza sativa L. japonica., Nagata K, Kudo N, Abe K, Arai S, Tanokura M, Biochemistry 2000 Dec 5;39(48):14753-60. PMID: 11101290

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