1. Krehl, W. A., Sarma, P. S., Teply, L. J., and Elvehjem, C. A., J. Nutrition, 31, 85 (1946).
2. Rosen, F., Huff, J. W., and Perlzweig, W. A., J. Biol. Chem., 163, 343 (1946).
3. Schweigert, B. S., and Pearson, P. B., J. Biol. Chem., 168, 555 (1947).
4. Singal, S. A., Sydenstricker, V. P., and Littlejohn, T., Fed. Proc., 6, 422 (1947).
5. Schweigert, B. S., Pearson, P. B., and Wilkening, M. C., Arch. Biochem., 12, 139 (1947).