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doi: 150

The imidazole nitrogen of the histidine side chain donates one of the three nitrogen ligands to the copper, and the position of histidine at the second residue is what enables the deprotonated amide nitrogen of the preceding Gly-His peptide bond to also coordinate the copper

Neurology 57:15151517 Coles LD, Tuite PJ, Oz G, Mishra UR, Kartha RV, Sullivan KM, Cloyd JC, Terpstra M (2018) Repeated-dose oral N-acetylcysteine in Parkinson's disease: pharmacokinetics and effect on brain glutathione and oxidative stress

Arabidopsis GR1 and GR2 possess 8 and 9 cysteines respectively but only the two catalytic cysteines at position 73 and 78 in AtGR1 are strictly conserved and Cys73 was reported as being subject to nitrosylation (Figure 3 and Supplementary Table 4