1. Ben-Nun, A., Wekerle, H. & Cohen, I. R. Eur. J. Immun. 11, 195–199 (1981).
2. Wekerle, H. Lab. Invest. 51, 199–205 (1984).
3. Swanborg, R. H. J. Immun. 130, 1503–1505 (1983).
4. Linington, C. et al. J. Immun. 133, 1946–1950 (1984).
5. Izumo, S., Linington, C., Wekerle, H. & Meyermann, R. Lab. Invest. (in the press).