1. Markham, R., and Smith, J. D., Biochem. J., 45, 294 (1949).
2. Hanes, C. S., and Isherwood, F. A., Nature, 164, 1107 (1949).
3. Benson, A. A., Methods in Enzymology, edit. by Colowick, S. P., and Kaplan, N. O., 6, 881 (Academic Press, London, 1963).
4. Sanger, F., Brownlee, G. G., and Barrell, B. G., J. Mol. Biol., 13, 373 (1965).
5. The Radiochemical Manual, Part I (The Radiochemical Centre, Araersham, Bucks., 1962).