1. Avery, O. T., McLeod, C. M., and McCarty, M., J. exp. Med., 79, 137 (1944).
2. Ledoux, L., in Progress in Nucleic Acid Research and Molecular Biology (edit. by Davidson, J. N., and Cohn, W. E.), 4, 231 (Academic Press, New York, 1965).
3. Bhargava, P. M., and Shanmugan, G., in Progress in Nucleic Acid Research and Molecular Biology (edit. by Davidson, J. N., and Cohn, W. E.), 11, 103 (Academic Press, New York, 1971).
4. Szybalski, E. H., and Szybalski, W., Proc. natn. Acad. Sci. U.S.A., 48, 2026 (1962).
5. Glick, J. L., and Salim, A. P., J. Cell. Biol., 33, 209 (1967).