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Klein J, Iovino M, Vakil M, Shinozaki H, Löffelholz K.Klein J, et al.Neuropharmacology. 1997 Mar;36(3):305-11. doi: 10.1016/s0028-3908(97)00024-5.Neuropharmacology. 1997.PMID: 9175608
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Köppen A, Klein J, Holler T, Löffelholz K.Köppen A, et al. Among authors: klein j.J Pharmacol Exp Ther. 1993 Aug;266(2):720-5.J Pharmacol Exp Ther. 1993.PMID: 8355203