3FTF:
reference: Structural Basis for Binding of RNA and Cofactor by a KsgA Methyltransferase., Tu C, Tropea JE, Austin BP, Court DL, Waugh DS, Ji X, Structure. 2009 Mar 11;17(3):374-85. PMID: 19278652

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