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. Author manuscript; available in PMC: 2010 Apr 28.
Published in final edited form as: Adv Drug Deliv Rev. 2009 Feb 20;61(4):351–363. doi: 10.1016/j.addr.2009.01.005

Fig. 1.

Fig. 1

Chemical reactions involved in formation of reactive oxygen species (ROS) and actions of ROS scavengers. Common ROS include O2−., hydrogen peroxide (H2O2), hydroxyl radical (OH.) singlet molecular oxygen (1O2), nitric oxide (NO) and peroxynitrite anion (ONOO−.). SOD = superoxide dismutase (modified from Wu et al. 1999 [7]).