1KS6:
reference: Solution structure of the chick TGFbeta type II receptor ligand-binding domain., Marlow MS, Brown CB, Barnett JV, Krezel AM, J Mol Biol 2003 Feb 28;326(4):989-97. PMID: 12589747

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