3MEF:
reference: Solution NMR structure and backbone dynamics of the major cold-shock protein (CspA) from Escherichia coli: evidence for conformational dynamics in the single-stranded RNA-binding site., Feng W, Tejero R, Zimmerman DE, Inouye M, Montelione GT, Biochemistry 1998 Aug 4;37(31):10881-96. PMID: 9692981

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