1. Asofsky, R., et al., Immunochemistry, 7, 497 (1970).
2. Tomasi, T. B., Tan, E. M., Solomon, A., and Prendergast, R. A., J. Exp. Med., 121, 101 (1965).
3. O'Daly, J. A., and Cebra, J. J., in Protides of the Biological Fluids (edit. by Peeters, H.), 205 (Elsevier, Amsterdam, 1968).
4. Cebra, J. J., and Small, P. A., Biochemistry, 6, 503 (1967).
5. Tomasi, T. B., and Bienenstock, J., in Adv. Immunol. (edit. by Dixon, F. J., and Kunkel, H. G.), 9, 1 (Academic Press, New York, 1968).