2OM3:
reference: High-resolution electron microscopy of helical specimens: a fresh look at tobacco mosaic virus., Sachse C, Chen JZ, Coureux PD, Stroupe ME, Fandrich M, Grigorieff N, J Mol Biol. 2007 Aug 17;371(3):812-35. Epub 2007 Jun 4. PMID: 17585939

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