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2. Szczepaniak, A.C.: J. Physiol. (London) 24, 55 (1974)
3. A preliminary account of this work has been presented: Barnett, D., Howden, M.E.H., Spence, I.: Proc. Aust. Physiol. Pharmacol. Soc. 10, 240P (1979)
4. Hartley, B.S.: Biochem. J. 119, 805 (1970)
5. Gage, P.W., Spence, I.: Aust. J. exp. biol. med. Sci. 55, 453 (1977)