1. 1. Leffler, H. & Svanborg–Eden, C. in Microbial Lectins and Agglutinins: Properties and Biological Activity (ed. Mirelman, D.) 83–111 (Wiley, New York, 1986). 2. Normark, S. et al. in Microbial Lectins and Agglutinins: Properties and Biological activity (ed. Mirelman, D.) 113–143 (Wiley, New York, 1986). 3. Lindberg, F. P., Lund, B. & Normark, S. EMBO J. 3, 1167–1173 (1984). 4. Lindberg, F., Lund, B. & Normark, S. Proc. natn. Acad. Sci. U.S.A. 83, 1891–1895 (1986). 5. Uhlin, B.–E., Norgren, M., Baga, M. & Normark, S. Proc. natn. Acad. Sci. U.S.A. 82, 1800–1804 (1985). 6. Lund, B., Lindberg, F., Marklund, B.–I. & Normark, S. Proc. natn. Acad. Sci. U.S.A. (in the press). 7. Boyer, H. W. & Roulland–Dussoix, D. J. molec. Biol. 41, 459–472 (1969). 8. Hull, R. A., Gill, R. E., Hsu, P., Minshew, B. H. & Falkow, S. Infect. Immunity 33, 933–938 (1981). 9. Baga, M., Norgren, M. & Normark, S. Cell 49, 241–251 (1987). 10. Emerson, S. V., Tokuyasu, K. & Simon, M. I. Science 169, 190–192 (1970). 11. Van Die, I., Zuidweg, E., Hoekstra, W. & Bergmans, H. Microb. Pathogen. 1, 51–56 (1986). 12. Lopez, J. & Webster, R. E. Virology 127, 177–193 (1983). 13. Grant, R. A., Lin, T.–C., Koningsberg, W. & Webster, R. E. J. biol. Chem. 256,539–546 (1981). 14. Riede, I., Drexter, K., Schwarz, H. & Henning, U. / molec. Biol. 194, 23–30 (1987). 15. Mooi, F. R., van Buuren, M., Koopman, G., Roosendaal, B. & de Graaf, F. K. J. Bact. 159,482–487(1984). 16. Mooi, F. R., Roosendaal, B., Oudega, B. & de Graaf, F. K. in Protein–Carbohydrate Interactions in Biological Systems, (ed. Lark, D. L.) 19–26 (Academic, London, 1986). 17. Maurer, L. & Orndorff, P. E. FEMS microbiol. Lett. 30, 59–66 (1985). 18. Mimion, F. C., Abraham, S. N., Beachey, E. H. & Goguen, J. D. J. Bact. 165, 1033–1036 (1986). 19. Baga, M. et al. J. Bact. 157, 330–333. 20. Frens, G. Nature 241, 20–22 (1973). 21. Norgren, M., Baga, M., Tennent, J. M. & Normark, S. Molec. Microbiol. (in the press). 22. Lowe, M. A., Holt, S. C. & Eisenstein, B. I. J. Bact. 169, 157–163 (1987).