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This cyclical approach is not arbitrary

Free radical metabolism in human erythrocytes

It can occur at any age but is more common in people over 50 years old

We found that intracellular 1-MNA and NNMT protein expression levels were substantially higher in the fully differentiated adipocytes compared to the undifferentiated pre-adipocytes, which is consistent with the differentiation-dependent enhancement in NNMT mRNA levels and enzymatic activity reported previously in the 3T3-L1 cell lines.[37] The higher levels of 1-MNA and NNMT in adipocytes compared to pre-adipocytes may partially account for our observations that increasing concentrations (10 60 M) of NNMT inhibitor did not completely eliminate 1-MNA in adipocytes, but did fully suppress 1-MNA accumulation in undifferentiated pre-adipocytes