4IW4:
reference: The serine protease domain of MASP-3: enzymatic properties and crystal structure in complex with ecotin., Gaboriaud C, Gupta RK, Martin L, Lacroix M, Serre L, Teillet F, Arlaud GJ, Rossi V, Thielens NM, PLoS One. 2013 Jul 4;8(7):e67962. doi: 10.1371/journal.pone.0067962. Print 2013. PMID: 23861840

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