1. Fildes, R. A., and Parr, C. W., Nature, 200, 890 (1963).
2. Fildes, R. A., and Parr, C. W., Proc. Sixth Intern. Cong. Biochem., 229 (New York, 1964).
3. Parr, C. W., and Fitch, L. I., Biochem. J., 93, 28C (1964).
4. Carter, N. D., Fildes, R. A., Fitch, L. I., and Parr, C. W. (submitted for publication).
5. Brewer, G. J., and Dern, R. J., Amer. J. Human Genet., 16, 472 (1964).