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This system enables control of intracellular SAM levels with spatio- and temporal precision, regulated by the expression of EOMT1 and the timing of eugenol addition. EOMT1 expression allowed concentration-dependent reduction of SAM levels within 30 min. The system revealed distinct histone marks such as H3K4me3, H3K9me3, and H3K27me3, which responded differentially to SAM perturbation, revealing variable sensitivity between histone methyltransferases and demethylases. 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