1FFK:
reference: The complete atomic structure of the large ribosomal subunit at 2.4 A resolution., Ban N, Nissen P, Hansen J, Moore PB, Steitz TA, Science 2000 Aug 11;289(5481):905-20. PMID: 10937989

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