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    Circadian Oscillation in Rat Liver Tryptophan Pyrrolase and its Analysis by Substrate and Hormone Induction

    SEVERAL circadian rhythms of hepatic enzymes have been reported1–3, but it has not been possible to analyse the mechanism which determines the oscillation of enzyme activities, even though various factors—such as...

    RÜDIGER HARDELAND, LUDGER RENSING in Nature (1968)