FIG. 2.

Tumor reducing capacity and GSH content. The reducing capacity of extracellular tissue microenvironment and concentration of intracellular GSH assessed in the normal mammary glands and mammary tumors of female FVB/N mice using in vivo electron paramagnetic resonance technique. (a) The reduction rate of the nitroxide redox probe in extracellular media of normal mammary glands and tumors. (b) Intracellular GSH concentrations measured using paramagnetic GSH-sensitive probes. Adapted from Bobko et al. (4) with permission.