5WI6:
reference: Dual functionality of beta-tryptase protomers as both proteases and cofactors in the active tetramer., Maun HR, Liu PS, Franke Y, Eigenbrot C, Forrest WF, Schwartz LB, Lazarus RA, J Biol Chem. 2018 Apr 16. pii: M117.812016. doi: 10.1074/jbc.M117.812016. PMID: 29661938

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