Haloperidol-induced catalepsy was challenged with prior intracollicular microinjections of glutamate NMDA receptor antagonists , MK-801 ( 15 or 30 mmol/0.5 microl ) and AP7 ( 10 or 20 nmol/0.5 microl ) , or of the NMDA receptor agonist N-methyl-d-aspartate ( NMDA , 20 or 30 nmol/0.5 microl ) .
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