Catecholamine Concentrations: Changes in Plasma of Rats during Estrous Cycle and Pregnancy

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Science  18 Feb 1966:
Vol. 151, Issue 3712, pp. 825-826
DOI: 10.1126/science.151.3712.825


Concentrations of norepinephrine in plasma of rats during estrus and pregnancy were significantly lower than during diestrus. Epinephrlne concentrations in the plasma were significantly higher in both estrous and diestrous females than in males.