1. Guest, J. R., and Woods, D. D., in 2 Europäisches Symposion über Intrinsic Factor, edit. by Heinrich, H. C., 686 (Ferdinand Enke Verlag, Stuttgart, 1962).
2. Foster, M. A., Tejerina, G., and Woods, D. D., Biochem. J., 81, 1P (1961).
3. Guest, J. R., Friedman, S., and Foster, M. A., Biochem. J. (Proc.) (in the press).
4. Keresztesy, J. C., and Donaldson, K. O., Biochem. Biophys. Res. Commun., 5, 286 (1961).
5. Donaldson, K. O., and Keresztesy, J. C., Biochem. Biophys. Res. Commun., 5, 289 (1961).