in addition , at 1600 , 1700 , and 1800 h , they were injected ivt with either vehicle ( cerebrospinal fluid or saline ) or one of the following compounds : epinephrine ( 15.3 micrograms ) , norepinephrine ( 15.3 micrograms ) , or prostaglandin e2 ( 6 micrograms ) .
C0014563
epinephrine
C0028351
norepinephrine