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2. H. Edery andI. M. Levinger, Neuropharmacology, in press.
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4. Preliminary results have been presented at the 21st Scientific Meeting of the Israel Physiol. Pharmac. Soc. (Isr. J. med. Sci.6, 321, 1970).
5. Adapted fromD. Beleslin, R. L. Polak andD. H. Sproull, J. Physiol. Lond.177, 420 (1965).