1GVZ:
reference: Crystal structure of a prostate kallikrein isolated from stallion seminal plasma: a homologue of human PSA., Carvalho AL, Sanz L, Barettino D, Romero A, Calvete JJ, Romao MJ, J Mol Biol 2002 Sep 13;322(2):325-37. PMID: 12217694

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