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Treatment of rats with 3-methylcholanthrene leads not only to a marked accumulation in the liver of translatable mRNA coding for a 56-kilodalton polypeptide representing cytochrome P-450c, the major 3-methylcholanthrene-induced cytochrome P-450 of rat liver, but also to the accumulation of comparable amounts of mRNA encoding a 52-kilodalton polypeptide which is immunoprecipitated with antibodies prepared against rat liver cytochrome P-450c. Further electrophoretic and immunochemical characterization of the latter translation product demonstrates that it corresponds to cytochrome P-450d, the major isosafrole-induced form of rat liver cytochrome P-450. The mRNAs for cytochromes P-450c and P-450d can be completely separated by electrophoresis in denaturing agarose gels and have chain lengths of approximately 4000 and 2000 nucleotides, respectively. These two mRNAs do not show detectable sequence homology to the mRNAs coding for the major phenobarbital-induced forms of cytochrome P-450 (P-450b and P-450e) since in Northern blotting experiments they fail to hybridize under conditions of low to moderate stringency to cloned probes for the latter mRNAs.
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