Development of the Diurnal Rhythm of Chick 3-hydroxy-3-methylglutaryl-CoA Reductase
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Chick liver and intestine 3-hydroxy-3-methylglutaryl-CoA reductase did not show diurnal rhythm at hatching. Differences in activity between light and dark periods appeared during the first week and remained more or less constant between 10-14 days after hatching. Hepatic and intestinal reductase activities were maximal during the light period and minimal during the dark period. Amplitude of the rhythm was practically similar in both tissues (about 3-fold) although specific activities and differences between peak and nadir values were always higher in liver. Chick brain reductase did not show significant diurnal variations in the age range assayed.
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