the effect on retention of the post-training intraperitoneal administration of acth1-24 ( 0.2 or 2.0 micrograms/kg ) , epinephrine hcl ( 5.0 or 50.0 micrograms/kg ) , human beta-endorphin ( 0.1 or 1.0 microgram/kg ) , naloxone ( 0.4 mg/kg ) , and of the combination of naloxone or beta-endorphin with acth or epinephrine was studied in two different but closely related step-down inhibitory avoidance tasks in rats : task 1 ( 5 cm high 25 x 25 cm platform ; 0.5 ma continuous footshock ) and task 2 ( 7 x 25 cm platform , 0.3 ma discontinuous footshock ) .
C0001636
epinephrine hcl
C0014563
epinephrine