1. Fasella, P., Lis, H., Siliprandi, N., and Baglioni, C., Biochim. Biophys. Acta, 23, 417 (1957).
2. “Amino-acid Metabolism”, Symposium, McCollum-Pratt Institute, p. 56 (1955).
3. Tonhazy, N. E., White, N. G., and Umbreit, W. W., Arch. Biochem., 28, 36 (1950).