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Conantokin G has been isolated from the venom of the cone Conus geographus. This toxin selectively inhibits NR2B subunits of N-methyl-D-aspartate (NMDA) receptor-mediated calcium influx in central nervous system neurons. Conantokin G induces sleep-like symptoms in young mice and hyperactivity in older mice(SERT). In this moment this compound is under phase II clinical trials under the name CGX-1007 by Cognetix Inc. It has been shown to be an effective antiepileptic agent in several animal models of seizur.