1. 1. Webster, R. E. & Lopez, J. in Virus Structure and Assembly (ed. Casjens, S.) 235–267 (Jones and Bartlett, Boston, 1985). 2. Makowski, L. in Biological Macromolecules and Assemblies Vol. 1 Virus Structures (eds Jurnak, F. A. & McPherson, A.) 203–253 (Wiley, New York, 1985). 3. Beck, E. et al. Nucleic Acids Res. 5, 4495–4503 (1978). 4. Van Wezenbeck, P. M. G. F., Hulsebos, T. J. M. & Schoenmakers, J. G. G. Gene 11,129–148 (1980). 5. Hill, D. F. & Petersen, G. B. / Virol. 44, 32–46 (1982). 6. Day, L. A. & Wiseman, R. L. in The Single-Stranded DNA Phages (eds Denhardt, D. T., Dressier, D. & Ray, D. S.) 605–625 (Cold Spring Harbor Laboratory, New York, 1978). 7. Marvin, D. A. in The Single-Stranded DNA Phages (eds Denhardt, D. T., Dressier D. & Ray, D. S.) 583–603 (Cold Spring Harbor Laboratory, New York, 1978). 8. Banner, D. W., Nave, C. & Marvin, D. A. Nature 289, 814–816 (1981). 9. Makowski, L. & Caspar, D. L. D. J. molec. Biol. 145, 611–617 (1981). 10. Holmes, K. C. in Structural Molecular Biology (eds Davies, D. B., Saenger, W. & Danyluk, S. S.) 475–505 (Plenum, New York, 1982). 11. Cross, T. A., Tsang, P. & Opella, S. J. Biochemistry 22, 721–726 (1983). 12. Armstrong, J., Hewitt, J. A. & Perham, R. N. EMBO J. 2, 1641–1646 (1983). 13. Ikoku, A. S. & Hearst, J. E. /. molec. Biol. 151, 245–259 (1981). 14. Grant, R. A., Lin, T.-C., Konigsberg, W. & Webster, R. E. /. biol. Chem. 256, 539–546 (1981). 15. Simons, G. F. M., Konings, R. N. H. & Schoenmakers, J. G. G. Proc. natn. Acad. Sci. U.S.A. 78,4194–4198 (1981). 16. Webster, R. E., Grant, R. A. & Hamilton, L. A. W. / molec. Biol. 152, 357–374 (1981). 17. Wickner, W. Proc. natn. Acad. Sci. U.S.A. 72, 4749–4753 (1975). 18. Ohkawa, I. & Webster, R. E. /. biol. Chem. 256, 9951–9958 (1981). 19. Lopez, J. & Webster, R. E. Virology 127, 177–193 (1983). 20. Carter, P. Biochem. J. 237, 1–7 (1986). 21. Boeke, J. D., Russel, M. & Model, P. /. molec. Biol. 144, 103–116 (1980). 22. Griffith, J. & Kornberg, A. Virology 59, 139–152 (1974). 23. Herrmann, R., Neugebauer, K., Zentgraf, H. & Schaller, H. Molec. gen. Genet. 159,171–178 (1978). 24. Kuhn, A., Wickner, W. & Kreil, G. Nature 322, 335–339 (1986). 25. Rowitch, D. H. & Perham, R. N. /. molec. Biol. (in the press). 26. Zoller, M. J. & Smith, M. Meth. Enzym. 100, 468–500 (1983). 27. Mathes, H. W. D. et al. EMBO J. 3, 801–805 (1984). 28. Sanger, F., Coulson, A. R., Barrell, B. G., Smith, A. J. H. & Roe, B. J. / molec. Biol. 143, 161–178 (1980). 29. Biggin, M. D., Gibson, T. J. & Hong, G. F. Proc. natn. Acad. Sci. U.S.A. 80,3963–3965 (1983). 30. Moses, P. B. & Horiuchi, K. Virology 119, 231–234 (1982). 31. Maniatis, T., Fritsch, E. F. & Sambrook, J. Molecular Cloning, a Laboratory Manual (Cold Spring Harbor Laboratory, New York, 1982).