1. Albanese, A. A., and Irby, V. (1944). J. biol. Chem., 153, 583.
2. Cramer, F. B. Jr., and Winnick, T. (1943). Ibid., 150, 259.
3. Frame, E. G., Russell, J. A., and Wilhelmi, A. E. (1943). Ibid., 149, 255.
4. Hamilton, P. B., and Van Slyke, D. D. (1943). Ibid., 150, 231.
5. Jagenburg, 0. R. (1959). Scand. J. clin. Lab. Invest., 11, suppl. 43, 59.