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Normalized EPR spectra of isotopically substituted NH2Y730•. Spectra were acquired with Y730NH2Y-α2/β2 containing [14N]-NH2Y or [15N]-NH2Y in H2O or D2O assay buffer in the presence of CDP/ATP. The ticks on the deuterated traces indicate the positions of the quartet and triplet peaks with [14N]- and [15N]-NH2Y730•, respectively. See text for details.
