we therefore compared the effects of 2 different footshock parameters , 3 min continuous shock ( 3 ma ) and 30 min intermittent shock ( 30 min , 1 s on 5 s off ) on the responsiveness to noxious stimuli and on brain enkephalins and humoral ( h- ) endorphin content in these strains of rats .
C0006104
brain
C0423896
content