1. 1. Monaco, A.P. et al. Nature 323, 646 (1986). 2. Monaco, A.P. & Kunkel, L.M. Trends Genet. 3,33 (1987). 3. Horowitz, R., Kempner, E.S., Bisher, M.E. & Podolsky, R.J. Nature323,160(1986). 4. Locker, R.H. & Wild, D.J.C. /. Biochem. 99,1473 (1986). 5. Kunkel, L.M. etal. Nature 322, 73 (1986). 6. Darras, B.T., Harper, J.F. & Francke, U. New Engl. J. Med. 316, 985 (1987). 7. Monaco, A.P., Bertelson, C.J., Colletti–Feener, C. & Kunkel, L.M. Hum. Genet. 75, 221 (1987). 8. vanOmmen,G.J.B.f/a/. Cell47,499 (1986). 9. Kenwick, S., Patterson, M., Speer, A., Fischbeck, K. & Davies, K. Cell 48, 351 (1987). 10. Burmeister, M. & Lehrach, H. Nature 324, 582 (1986).