Abstract
The three DNA polymerase activities identified in early embryos of Xenopus laevis (Benbow et al., 1975) were further distinguished by their template preferences, pH optima and sensitivity to monovalent cations. In addition, endo and exonuclease activities at pH 7.5 were identified and monitored through early development. Endonuclease activity increased throughout early development while exonuclease activity remained nearly constant. These nuclease activities were not responsible for the different template preferences of the partially purified DNA polymerase activities.
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