1. 1. Monaco, A. P. & Kunkel, L. M. Adv. Hum. Genet. 17, 61–98 (1988). 2. Nudel, U., Zuk, D., Zeelon, E., Levy Z., Neuman, S. & Yaffe, D. Nature 337, 76–78 (1989). 3. Feener, C. A., Koenig, M. & Kunkel, L. M. Nature 338, 509–511 (1989). 4. Chelly, J. et al. Eur. J. Biochem. (in the press). 5. Chelly, J., Kaplan, J. C., Maire, P., Gautron, S. & Kahn, A. Nature 333, 858–860 (1988). 6. Berwald-Netter, Y., Martin-Moutot, N., Koulakoff, A. & Couraud, F. Proc. natn. Acad. Sci. U.S.A. 78, 1245–1249 (1981). 7. Nowak, L, Ascher, P. & Berwald-Netter, Y. J. Neurosci. 7, 101–109 (1987). 8. Nudel, U., Robzyk, K. & Yaffe, D. Nature 331, 635–638 (1988). 9. Chamberlain, S. C. et al. Science 239, 1416–1418 (1988). 10. Huffman, E. P., Hudecki, M. S., Rosenberg, P. A., Pollina, C. M. & Kunkel, L. Neuron l, 411–420 (1988). 11. Chelly, J., Concordei, J. P., Kaplan, J. C. & Kahn, A. Proc. natn. Acad. Sei. U.S.A. 86, 2617–2621 (1989). 12. Couraud, F., Martin-Moutoy, N., Koulakoff, A. & Berwald–Netter, Y. J. Neurosci. 6,192–198 (1986). 13. Eddé, B. et ai. Biol. Cell 65, 109–117 (1989).