3H4S:
reference: Structure of the complex of a mitotic kinesin with its calcium binding regulator., Vinogradova MV, Malanina GG, Reddy AS, Fletterick RJ, Proc Natl Acad Sci U S A. 2009 May 19;106(20):8175-9. Epub 2009 May 5. PMID: 19416847

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