1. Kyogoku, Y., Tsuboi, M., and Shimanouchi, T., Abst. Thirteenth Annual Meeting Chem. Soc. Japan, 239 (April 1960). Details of our experiments on nucleosides will be published elsewhere.
2. Watson, J. D., and Crick, F. H. C., Nature, 171, 737 (1953).
3. Watanabe, I., Shimanouchi, T., Tsuboi, M., Kyogoku, Y., and Takanami, M., Abst. Symp. on Protein Structure, Chem. Soc. Japan, Osaka, 3 (October 1959). Details of our experimental results for ribonucleic acid and microsomal particles under various conditions will be published elsewhere.
4. Franklin, R. E., and Gosling, R. G., Acta Cryst., 6, 673 (1953).
5. Sutherland, G. B. B. M., and Tsuboi, M., Proc. Roy. Soc., A, 239, 446 (1957).