1. Crane, R. K., Miller, D. & Bihler, I. in Membrane Transport and Metabolism (eds Kleinzeller, A. & Kotyk, A.) 439–449 (Czech. Acad. Sci., Prague, 1961).
2. Wright, E. M., Hager, K. M. & Turk, E. Curr. Opin. Cell Biol. 4, 696–702 (1992).
3. Ganapathy, V., Brandsch, M. & Leibach, F. H. Physiology of the Gastrointestinal Tract 3rd edn (ed. Johnson, L. R.) 1773–1794 (Raven, New York, 1994).
4. Tsay, Y.-F., Schroeder, J., Feldmann, K. A. & Crawford, N. M. Cell 72, 705–713 (1993).
5. Perry, J. R., Basral, M. A., Steiner, H.-Y., Naider, F. & Becker, J. M. Molec. cell. Biol. 14, 104–115 (1994).