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Phospholipid liposomes affect the histone pattern of isolated rat liver nuclei. Multilamellar vesicles (MLV) obtained with phosphatidylserine (PS) release a large amount of the lysine rich histones, while those obtained with phosphatidylcholine (PC) do not induce significant changes with respect to controls. This different response has been compared to the effects obtained with Heparin, which slightly modifies the relative ratio of the histone fractions. These data might account for the mode by which phospholipids induce transitions of the chromatin structure and changes of the endogenous RNA polymerase activity.
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