1. Bezkorovainy, A., and Rafelson, jun., M. E., J. Lab. Clin. Med., 64, 212 (1964).
2. Bettex-Galland, M., and Luscher, E. F., Biochim. Biophys. Acta, 49, 536 (1961).
3. Grette, K., Acta Physiol. Scand., 56, suppl. 195, 49 (1962).
4. Humphrey, J. H., Nature, 176, 38 (1955).
5. Kinosta, R., Ohno, S., and Bierman, H. R., Motion Picture, Thrombopoiesis (City of Hope Medical Center, Duarte, California, 1957).