Abstract
1. Deoxyribonuclease activity has been determined by viscosimetry in the serum of the Ehrlich Ascites in the mouse to be equivalent to 2,3 ± 0,7·10-6 g/ml of crystalline beef pancreas DNase. 2. Injections of heterologous deoxyribonucleic acid into the Ehrlich Ascites tumor under specified conditions does not alter tumor development. 3. The same DNA however becomes strongly inhibitory for tumor growth after UV irradiation. 4. Possible implications are discussed.

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