2 ) activation of gaba-b receptors with gaba ( 10 ( -6 ) -10 ( -3 ) m ) or ( - ) -baclofen ( 10 ( -6 ) -10 ( -3 ) m ) caused a dose-related inhibition of twitch response that was about 80 % lower in preparations from morphine-tolerant animals than in controls .
C0016904
gaba
C0004609
baclofen