6EHG:
reference: A potent complement factor C3 specific nanobody inhibiting multiple functions in the alternative pathway of human and murine complement., Jensen RK, Pihl R, Gadeberg TAF, Jensen JK, Andersen KR, Thiel S, Laursen NS, Andersen GR, J Biol Chem. 2018 Mar 1. pii: RA117.001179. doi: 10.1074/jbc.RA117.001179. PMID: 29497000

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