when the nonprotein chromophore of neocarzinostatin was allowed to react with either calf thymus dna or poly ( da-dt ) . poly ( da-dt ) in the presence of 2-mercaptoethanol and the dna was precipitated with ethanol , 5 % of the fluorescence attributable to the naphthalene rings of the chromophore coprecipitated with the dna .
C0025402
mercaptoethanol
C0001962
ethanol