chronically catheterized fetal lambs at either 131 +/- 1 ( preterm ) or 142 +/- 1 days ( term ) received graded infusions of either epinephrine ( e ) or norepinephrine ( ne ) at rates of 0.04 , 0.2 , 0.75 , 1.5 , and 3.0 micrograms.min-1.kg-1 during successive 40-min infusion periods .
C0014563
epinephrine
C0028351
norepinephrine