“…Norbornan (NB, exo,cis-5,6-dichloro-2,2-dicyano-3,3-bis-(trifluoromethyl)-norbornane; bicycloheptane) is a useful tool to study the mechanisms of kindling [1,3]. Norbornan is a convulsant, an irreversible blocker of GABA A receptor chlorine channels [2,3]. It has been previously demonstrated that single injection of NB to albino mice led to sustained sensitization to picrotoxin and 3-mercaptopropionic acid toxicity [2].…”