Abstract
[Ger. and Fr. sum,][long dash]short term incubation of acute leukemia cells indicates that for every 1000 cells which incorporate H3 thymidine, fewer than 1 divides/hr. In the same system, 1 atypical lymphocyte from infectious mononucleosis divides for every 100 cells in DNA synthesis. These data support the idea that cell division is slow in acute leukemia, and that, in contrast, cells are rapidly proliferating in infectious mononucleosis.