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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Annu Rev Biochem. 2009;78:65–94. doi: 10.1146/annurev.biochem.78.091707.100215

Figure 7.

Figure 7

Proposed mechanisms for P-methyltransferase. A. Heterolytic pathway transferring a methyl group from MeCbl as a methyl cation equivalent. B. Homolytic pathway transferring the methyl group as a radical.