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 .