steady state levels of catecholamines ( dopamine , norepinephrine , and epinephrine ) were measured by the use of radioenzymatic techniques in discrete areas of the kidney ( outer and inner cortex , outer and inner medulla ) dissected by a `` '' punch '' '' technique from frozen kidney sections of salt-sensitive ( ds ) and salt-resistant ( dr ) dahl rats fed a low or high salt diet .
C0028351
norepinephrine
C0014563
epinephrine