FIGURE 5.

Formation of NFK as a result of the peroxide reaction with ferric TDO (5 μm) and l-Trp (5 mm). The spectra were taken from the anaerobic titration of 35 eq of H₂O₂ (total 175 μm) in the absence (A) and presence (B) of hydroxyurea (10 mm). Each trace was obtained after the reaction was complete and subtracted against a spectrum of ferric TDO at the same concentration (5 μm).