1MHD:
reference: Crystal structure of a Smad MH1 domain bound to DNA: insights on DNA binding in TGF-beta signaling., Shi Y, Wang YF, Jayaraman L, Yang H, Massague J, Pavletich NP, Cell 1998 Sep 4;94(5):585-94. PMID: 9741623

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