3VTO:
reference: Crystal structure of the C-terminal domain of Mu phage central spike and functions of bound calcium ion., Harada K, Yamashita E, Nakagawa A, Miyafusa T, Tsumoto K, Ueno T, Toyama Y, Takeda S, Biochim Biophys Acta. 2013 Jan;1834(1):284-91. doi: 10.1016/j.bbapap.2012.08.015., Epub 2012 Aug 24. PMID: 22922659

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