2L4V:
reference: Solution structure of a phytocystatin from Ananas comosus and its molecular interaction with papain., Irene D, Chung TY, Chen BJ, Liu TH, Li FY, Tzen JT, Wang CI, Chyan CL, PLoS One. 2012;7(11):e47865. doi: 10.1371/journal.pone.0047865. Epub 2012 Nov 6. PMID: 23139757

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