The inhibition by γ-irradiation of incorporation of 32P into rat thymocytes in vitro

Abstract
A medium was found in which a large proportion of a respiring suspension of thymic cells retain their normal appearance, as judged by phase-contrast microscopy, for periods up to 2 hours. Uptake of P32 into the deoxyribonucleic acid of the respiring thymocytes was inhibited by 600-950 r of gamma-irradiation. There was an increase in the specific activity of adenosine triphosphate in the irradiated suspensions. Incorporation of P32 into ribonucleic acid was unaffected in vitro.