1D1R:
reference: A phylogenetic approach to target selection for structural genomics: solution structure of YciH., Cort JR, Koonin EV, Bash PA, Kennedy MA, Nucleic Acids Res 1999 Oct 15;27(20):4018-27. PMID: 10497266

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