A series of pulse-doses of 7, 8, 12-trimethylbenz(a)anthracene-induced leukemia rapidly and consistently in very high yield in rats of Long-Evans (L-E) strain. The predominant type was a diffuse hepatic leukemia of erythroblastic stem cells.

Progressive hypothermia and a decline in pituitary function are newly recognized signs of advanced leukemia in rat.

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