1SQF:
reference: The first structure of an RNA m5C methyltransferase, Fmu, provides insight into catalytic mechanism and specific binding of RNA substrate., Foster PG, Nunes CR, Greene P, Moustakas D, Stroud RM, Structure (Camb) 2003 Dec;11(12):1609-20. PMID: 14656444

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