5LCY:
reference: The Effectors and Sensory Sites of Formaldehyde-Responsive Regulator FrmR and Metal-Sensing Variant., Osman D, Piergentili C, Chen J, Sayer LN, Uson I, Huggins TG, Robinson NJ, Pohl E, J Biol Chem. 2016 Jul 29. pii: jbc.M116.745174. PMID: 27474740

This OCA Structure page
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