Caswell, A. H. & Pressman, B. C. (1972) Biochem. Biophys. Res. Commun. 49, 292-298 Dahlquist, R. & Diamant, B. (1972) Proc. Int. Congr. Pharmacol. 5th 50 Foreman, J. C. & Mongar, J. L. (1972) J. Physiol. (London) 224, 353-369 Foreman, J. C. & Mongar, J. L. (1973) J. Physiol. (London) in the press Mongar, J. L. & Schild, H. 0. (1958) J. Physiol. (London) 140, 272-284 Scarpa, A., Baldassare, J. &...