On the Synthesis of RNA in Lymphocytes Stimulated by Phytohemagglutinin

The experimental conditions to study lymphocyte transformation in cultures derived from bovine lymph nodes are described. Both deoxyribonucleoprotein‐bound and soluble RNA polymerase can conveniently be tested in cell lysates. During the course of transformation the activities of the two enzymes begin to rise at the same time when the cells begin to accumulate stable RNA. At 30 h after addition of phytohemagglutinin both enzyme activities are enhanced by a factor of two over the controls.