1. Myrbäck, K., and Willstaedt, E., Arkiv. för Kemi, 8, 367 (1955).
2. Myrbäck, K., Archiv. Biochem. Biophys., 69, 138 (1957).
3. cf. Gottschalk, A., “Encyclopedia of Plant Physiology”, 6, 87, (Springer Verlag, Berlin, 1958).
4. Hughes, D. E., Brit. J. Exp. Path., 32, 97 (1951).
5. cf. Northcote, D. H., and Horne, R. W., Biochem. J., 51, 232 (1952).