by contrast , 3-amino-propylphosphonic acid ( 3-appa ) behaved as a partial agonist , itself partly depressing ileal twitch contractions in a manner sensitive to 4-abpa and phaclofen , as well as antagonizing the depression of the ileal twitch by gaba and baclofen ( apparent pa2 = 4.0 +/- 0.2 ) .
C0016904
gaba
C0004609
baclofen