3FIP:
reference: Insights into pilus assembly and secretion from the structure and functional characterization of usher PapC., Huang Y, Smith BS, Chen LX, Baxter RH, Deisenhofer J, Proc Natl Acad Sci U S A. 2009 May 5;106(18):7403-7. Epub 2009 Apr 20. PMID: 19380723

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