2XXL:
reference: Structure-function analysis of grass clip serine protease involved in Drosophila Toll pathway activation., Kellenberger C, Leone P, Coquet L, Jouenne T, Reichhart JM, Roussel A, J Biol Chem. 2011 Apr 8;286(14):12300-7. Epub 2011 Feb 10. PMID: 21310954

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