1. Mosier, D. E., Mond, J. J., Zitron, I. M., Scher, I. & Paul, W. E. in Immune System: Genetics and Regulation (eds Sercarz, E. E., Herzenberg, L. A. & Fox, C. F.) 699–706 (Academic, New York, 1977).
2. Lewis, G. K., Ranken, R., Nitecki, D. E. & Goodman, J. M. J. exp. Med. 144, 382–397 (1976).
3. Poe, W. J. & Michael, J. G. Immunology 30, 241–248 (1976).
4. Prange, C. A., Green, C., Nitecki, D. E. & Bellone, C. J. J. Immun. 118, 1311–1316 (1977).
5. Jacobs, D. M. & Morrison, D. C. J. exp. Med. 141, 1453–1458 (1975).