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- W2074487206 abstract "1. Heparin activates endogenous DNA polymerase activity in isolated rat hepatic nuclei to a synthesis rate two to three times the control values, when added in amounts as small as 10% of total nuclear DNA. 2. Cations such as polylysine, polyornithine and unfractionated histones form insoluble complexes with heparin and reverse its effect in either order of addition. 3. Autoradiography demonstrates many apparent new sites of DNA synthesis in heparin-treated nuclei, both in previously inactive and in previously active nuclei. 4. Electron microscopy shows a dramatic change in the chromatin pattern upon treatment with heparin; fiber diameters are significantly decreased, probably indicating loss of supercoiling. 5. The response to heparin of the endogenous polymerase activity in three chromatin fractions is examined. Two of the three fractions show patterns similar to whole nuclei; the third, a high specific activity fraction, has a distinctively different pattern of response to heparin. 6. The kinetic data combined with the behavior of the high specific activity chromatin fraction indicate that the heparin effect on endogenous DNA synthesis may have more than one component." @default.
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- W2074487206 date "1973-04-01" @default.
- W2074487206 modified "2023-09-25" @default.
- W2074487206 title "The effects of heparin on endogenous DNA polymerase activity of rat liver nuclei and chromatin fractions" @default.
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- W2074487206 doi "https://doi.org/10.1016/0014-4827(73)90068-2" @default.
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