tokens: Seizure activity due to PTZ and picrotoxin ( PTX ) was significantly decreased ; however , seizure activity due to 3 - mercaptopropionic acid ( MPA ) , bicuculline ( BCC ) , methyl 6 , 7 - dimethoxy - 4 - ethyl - B - carboline - 3 - carboxylate ( DMCM ) , or strychnine ( STR ) was not different from control .