Book excerpt: Methods in Redox Signaling is the first and only comprehensive handbook on the experimental methods used to study redox signaling. Formerly recognized as destructive mechanisms, reactive oxygen species (ROS) have now been recognized as saviors by protecting the cells through redox signaling. This evolving science involves the pathobiology of various disease processes including cancer, cardiovascular diseases, wound healing, and many other degenerative diseases. Although the concept of reactive oxygen species has been known to some for decades, their potential role in the biological system has only been recognized in recent years. With the identification of these new mechanisms and their potential, the exploration in this area is expanding rapidly and the scientific articles are pouring in. Being relatively young, a vast majority of the mechanisms of redox signaling, especially those related to disease processes still remain unknown. Methods in Redox Signaling provides a valuable tool for the growing number of scientists engaging in the research and investigation involving redox regulation of degenerative diseases.