1CTO:
reference: Solution structure of an extracellular domain containing the WSxWS motif of the granulocyte colony-stimulating factor receptor and its interaction with ligand., Yamasaki K, Naito S, Anaguchi H, Ohkubo T, Ota Y, Nat Struct Biol 1997 Jun;4(6):498-504. PMID: 9187659

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