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Electron transfer from the Fe protein to the MoFe protein monitored by stopped-flow spectroscopy. Shown is the absorbance at 430 nm plotted against the time after mixing ADP-ribosylated or unmodified Fe protein (68 μM) and MoFe protein (18 μM) in one syringe with buffer (100 mM MOPS, pH 7.4, and 18 mM Mg-ATP) or in the absence of nucleotide as a control.
