Created myself using Pymol and the <span class="plainlinks"><a href="https://en.wikipedia.org/wiki/Protein_Data_Bank" class="extiw" title="w:Protein Data Bank">PDB</a>: <a rel="nofollow" class="external text" href="http://www.rcsb.org/pdb/explore/explore.do?structureId=1SVC">1SVC</a></span>​ crystallographic structure
Original uploaded by <a href="https://en.wikipedia.org/wiki/User:Boghog" class="extiw" title="en:User:Boghog">Boghog</a> (Transfered by <a href="//commons.wikimedia.org/wiki/User:Vojtech.dostal" title="User:Vojtech.dostal">Vojtech.dostal</a>)
Original uploaded on en.wikipedia