title: Catecholamine Concentrations: Changes in Plasma of Rats during Estrous Cycle and Pregnancy.
abstract: 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.
authors.forename: R D
authors.initials: RD
authors.lastname: Green
authors.forename: J W
authors.initials: JW
authors.lastname: Miller