| http://www.w3.org/ns/prov#value | - Hydrogen peroxide is not a free radical but can cross cell membranes and act as a potent cytotoxin, inactivating enzymes via oxidation of essential thiol groups.19 Because not all molecules that cause oxidative injury are free radicals, such as hydrogen peroxide, ROS is a more inclusive term.1 The hydrogen peroxide molecule is held together weakly by oxygen bonds.
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