1. Hill, R. L., Adv. Prot. Chem., 20, 37 (1965).
2. Alvord, E. C., in The Central Nervous System (edit. by Bailey, O. T. and Smith, D. E.), 52 (Williams and Wilkins, Baltimore, 1968).
3. Kies, M. W., Ann. NY Acad. Sci., 122, 161 (1965).
4. Offord, R. E., Nature, 211, 591 (1966).
5. Gray, W. R., in Methods in Enzymology (edit. by Colowick, S. P. Kaplan, N. O. and Hirs, C. H. W.), 11, 469 (1967).