5H3R:
reference: Structural characterization of the DNA-binding mechanism underlying the copper(II)-sensing MarR transcriptional regulator., Zhu R, Hao Z, Lou H, Song Y, Zhao J, Chen Y, Zhu J, Chen PR, J Biol Inorg Chem. 2017 Jul;22(5):685-693. doi: 10.1007/s00775-017-1442-7. Epub, 2017 Jan 25. PMID: 28124121

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