Free radicals are important because they can damage cells. This capacity lies in their ability to alter biological molecules. The types of modifications caused by such radicals pose a risk to cellular homeostasis and could provoke the death of an individual cell and eventually an organism. All molecules are more or less sensitive to oxidation; however, the effect is different depending on the type of molecule affected, the role ofsuch a molecule in cellular physiology, the existence ofrepair mechanisms and the possibility of a removal of toxic products.
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