Early changes in S-adenosylhomocysteine (SAH) hydrolase activity during DMSO-induced granulocytic differentiation of HL-80 ceils were followed. Within 24 h a decrease of activity of SAH hydrolase could be detected in induced cultures but not in control cultures. This decrease could be shown to be associated with G1 phase of the cell cycle and was detected prior to phenotypic changes of the ceils.

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