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- ArticleAntoniades D, Antonoglou O.Biochim Biophys Acta. 1977 Feb 16;474(4):609-18.A polyadenylase, degrading specifically poly(A) sequences was isolated from Escherichia coli K12. The enzyme was purified about 850 times to practically electrophoretic homogeneity. It was free of poly(A) polymerase activity, as well as of the well known E. coli RNAases I and II. It is stimulated by bivalent cations like Mg2+ and Mn2+ and splits poly(A) to 3'-AMP and therefore it can be considered as an exonuclease. The enzyme does not degrade any other ribohomopolymer or RNA.