title: The 5-Ht3 Receptor Antagonist Gr68755 Hydrochloride Modifies Cognitive Performance in the Marmoset: Costall B, Domeney AM, Gerrard PA, Jones DNC, Naylor RJ, Tyers MB1, School of Studies in Pharmacology, University of Bradford, Bradford, West Yorkshire, BD7 1DP and Neuropharmacology Department, Glaxo Group Research Ltd., Ware, Hertfordshire, SG12 ODP.