1. Bernardi, G., Champagne, M., and Sadron, C., Nature, 188, 228 (1960).
2. Bernardi, G., Champagne, M., and Sadron, C., Biochim. Biophys. Acta, 49, 1 (1961).
3. Watson, J. D., and Crick, F. H. C., Nature, 171, 737 (1953).
4. Bernardi, G. (manuscript in preparation).
5. Sadron, C., The Nucleic Acids, 3, 1, edit. by Chargaff, E., and Davidson, J. N. (Academic Press, New York, 1960).