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A deoxyadenosyl radical is a free radical that is structurally related to adenosine by removal of a 5´-hydroxy group from adenosine. This radical occurs in nature as a reactive intermediate. It is generated by radical SAM enzymes and by some varieties of vitamin B₁₂. The deoxyadenosyl radical abstracts hydrogen atoms from substrates, causing rearrangements and other post transcriptional modifications

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