4I2W:
reference: The myosin chaperone UNC-45 is organized in tandem modules to support myofilament formation in C. elegans., Gazda L, Pokrzywa W, Hellerschmied D, Lowe T, Forne I, Mueller-Planitz F, Hoppe T, Clausen T, Cell. 2013 Jan 17;152(1-2):183-95. doi: 10.1016/j.cell.2012.12.025. PMID: 23332754

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