Figure 3. Levels of Cu/Zn SOD (SOD1) and Mn-SOD (SOD2) in three regions of the rat cochlea. SOD protein levels were determined by ELISA using polyclonal antibodies against SOD1 and SOD2. Optical density of the color reaction of each sample was detected at 490 nm in an ELISA plate reader. Bars show one standard deviation above the mean. (Data from Yao and Rarey, 1996.)