1. Kunkel, H. G., Fudenberg, H. H., and Ovary, Z., Ann. N.Y. Acad. Sci., 86, 966 (1960).
2. Heremans, J. F., Vaerman, J.-P., and Vaerman, C., J. Immunol., 91, 11 (1963).
3. Kunkel, H. G., and Rockey, J. H., Proc. Soc. Exp. Biol. Med., 113, 278 (1963).
4. Yagi, Y., Maier, P., Pressman, D., Arbesman, C. E., Reisman, R. E., and Lenzner, A. R., J. Immunol., 90, 760 (1963).
5. Fahey, J. L., and Goodman, H., Science, 143, 588 (1964).