Abstract

A high level of RNA-directed DNA polymerase activity is found in spleens of Balb c mice infected with Rauscher murine leukemia virus. The enzyme is associated with sedimentable subcellular fractions, can be separated from other cellular DNA polymerases, and is present in useful quantity for purification purposes. Complete solubilization of the enzyme, achieved and maintained by using a combination of detergent and high salt solution, is required for a satisfactory purification both in the initial extraction procedure and in subsequent column chromatography.

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