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In contrast to other oxidative modifications of amino acids, methionine sulfoxide can be enzymatically reduced back to methionine in proteins by the peptide methionine sulfoxide reductase system, composed of MsrA and MsrB. The expression of MsrA and one member of the MsrB family, hCBS-1, was analyzed during replicative senescence of WI-38 human fibroblasts. Gene expression decreased for both enzymes...
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