Fig. (3).

Typical example of the ESR spectra obtained from 10⁷ equine endothelial cells submitted either to normoxia (A) or to a single 1 hour-period of anoxia/reoxygenation with addition of 100 mM DMPO at the time of reoxygenation (B). The spectrum B is characteristic of the reaction of DMPO with superoxide anion. Results from 3 separate experiments.