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alpha-Satellite DNA containing chromatin from African green monkey cells (CV-1 cells) has been used to study the question whether or not nucleosomes are arranged in phase with the 172 bp repeat unit of the satellite DNA. Digestion experiments with DNAase II led us to exclude a simple phase relationship between the nucleosomal and the satellite DNA repeats. Digestion of CV-1 nuclei with micrococcal nuclease and endogenous nuclease (s) produced a series of sharp bands in the satellite DNA register over a background of heterogeneous length fragments. This observation is explained by a preferential cleavage of certain nucleotide sequences by these nucleases and is not in contradiction to our conclusion that a simple phase relationship does not exist.

Subunit structure of α-satellite DNA containing chromatin from African green monkey cells