3GXW:
reference: Structure and in vivo requirement of the yeast Spt6 SH2 domain., Dengl S, Mayer A, Sun M, Cramer P, J Mol Biol. 2009 May 29;389(1):211-25. Epub 2009 Apr 14. PMID: 19371747

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