1. Field, M., Fromm, D., Wallace, K., and Greenough, W. B., J. Clin. Invest., 48, 24a (1969).
2. Al Awgati, Q., Cameron, J. L., Field, M., and Greenough, W. B., J. Clin. Invest., 49, 2a (1970).
3. Kimberg, D. V., Field, M., Johnson, J., Henderson, A., and Gershon, E., J. Clin. Invest., 50, 1218 (1971).
4. Vaughan, M., Pierce, N. F., and Greenough, W. B., Nature, 226, 658 (1970).
5. Graybill, J. R., Kaplan, M. M., and Pierce, N. F., Clin. Res., 18, 454 (1970).