1. Li, J. G., and Osgood, E. E., Blood, 4, 670 (1949).
2. Osgood, E. E., and Krippaehne, M. L., Exp. Cell Res., 9, 116 (1955).
3. Nowell, P. C., Cancer Res., 20, 462 (1960).
4. de la Chapelle, A., Lancet, i, 1348 (1961).
5. Beckman, L., Fichtelius, K. E., Finley, S. C., Finley, W. H., and Lindahl-Kiessling, K., Hereditas, 48, 619 (1962).