Peripheral blood lymphocyte nucleoi of rats with Yoshida ascitic sarcoma and the effect of endotoxin.

: Nucleoli of lymphocytes were studied in the peripheral blood of male Wistar rats bearing Yoshida ascitic tumor untreated and treated with Escherichia coli endotoxin. Both the neoplastic process and the endotoxin produced an increase of peripheral lymphocytes with "active" nucleoli in number. The treatment of experimental animals bearing the tumor with the endotoxin decreased their mortality and enhanced the increase of the lymphocytes with "active" nucleoli in their peripheral blood.