1. Killman, S. A., Acta Med. Scand., 178, 263 (1965).
2. Mauer, A. M., and Fisher, V., Blood, 28, 428 (1966).
3. Cronkite, E. P., in Perspectives in Leukemia, Symp. Leukemia Soc., Inc., New Orleans, Louisiana, 1966, (in the press).
4. Gavosto, F., Pileri, A., Bachi, C., and Pegoraro, L., Nature, 203, 92 (1964).
5. Pileri, A., Gabutti, V., Masera, P., and Gavosto, F., Acta-Haematol. (in the press).