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Highly purified preparations of RNA-directed DNA polymerase from avian myeloblastosis virus (AMV) contain a Mn2+-activated endonuclease activity capable of nicking supercoiled DNA. This endonuclease activity co-sediments in glycerol gradients with the alphabeta form of AMV DNA polymerase, and co-chromatographs with DNA polymerase activity on DEAE-cellulose, phosphocellulose, and heparin-Sepharose. It is also present in AMV alphabeta-DNA polymerase purified by electrophoresis throughpmid:83998 fatcat:yavbwbt3vjaahga7aztbfzevzy