1. Bourne, H. R., Lichtenstein, L. M., Melmon, K. L., Henney, C. S., Weinstein, Y., and Shearer, G. M., Science, 184, 19–28 (1974).
2. Watson, J., Epstein, R., and Cohn, M., Nature, 246, 405–409 (1973).
3. Pick, E., Immunology, 26, 649–658 (1974).
4. Lomnitzer, R., Rabson, A. R., and Koornhof, H. J., Clin. exp. Immun., 24, 42–48 (1976).
5. Epstein, L. B., and Bourne, H. R., in Mitogens in Immunobiology (edit. by Oppenheim, J. J., and Rosenstreich, D. L.), 453–462 (Academic, New York, 1976).