6M3Y:
reference: Crystal structure of lactobacillar SpaC reveals an atypical five-domain pilus tip adhesin: Exposing its substrate-binding and assembly in SpaCBA pili., Kant A, Palva A, von Ossowski I, Krishnan V, J Struct Biol. 2020 Jul 9:107571. doi: 10.1016/j.jsb.2020.107571. PMID: 32653644

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