As we live and breathe: free radicals and aging. Correlative evidence from a number of fields suggests they may be key.
Edgington
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D000375:Aging; D000690:Amyotrophic Lateral Sclerosis / Q000201:enzymology / Q000235:genetics; D017209:Apoptosis; D004249:DNA Damage; D015444:Exercise; D016166:Free Radical Scavengers; D005609:Free Radicals; D006801:Humans; D009154:Mutation; D009336:Necrosis; D010084:Oxidation-Reduction; D011506:Proteins / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000235:genetics; D019253:Proto-Oncogene Proteins c-bcl-2; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000235:genetics
D016166:Free Radical Scavengers; D005609:Free Radicals; D011506:Proteins; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D017382:Reactive Oxygen Species; D013482:Superoxide Dismutase