Abstract

Treatment of rat thymus lymphocytes with antithymocyte serum and gamma globulins from such serum reduced the rate of uridine incorporation in these cells. The reduction of uridine incorporation in small lymphocytes was paralleled by a reduced capacity of nuclear deoxyribonucleoprotein to bind tritium labelled actinomycin D, suggesting that the reduced uridine incorporation is due to modifications of the nuclear deoxyribonucleoprotein complex. These modifications may be triggered by changes in the cell membrane caused by the binding of antibodies to membrane components.

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