Hydrogen bonding of the dissociated histidine ligand is not required for formation of a proximal NO adduct in cytochrome c’ - Dlzar D. Ghafoor; Demet Kekilli; Gaylany H. Abdullah; Florian S. N. Dworkowski; Hamid G. Hassan; Michael T. Wilson; Richard W. Strange; Michael A. Hough (JBIC Journal of Biological Inorganic Chemistry, 2015)