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Nucleic Acids Research, 1983, Vol. 11, No. 3 647-658
© 1983


MOLECULAR BIOLOGY

Unmethlated domains in vertebrate DNA

David N. Cooper, Mary H. Taggart and Adrian P. Bird

MRC Mammalian Genome Unit, King's Buildings, West Mains Road Edinburgh EH9 3JT, UK

Received December 11, 1982. Accepted January 7, 1983.

We have detected a fraction that is rich in unmethylated HpaII and Hhal sites by end-abelling HpaII fragments of chicken DNA. The fraction is not obvious when DNA fragments are stained with ethidium bromide as it amounts to less than 2% of the genome. The average frequency of sites for HpaII is over thirteen times greater in the unmethylated fraction than in total DNA. Partial digests indicate that the unmethylated sites are clustered in the genome. Similar unmethylated fractions were detected in six other vertebrates in both somatic and germ line DNA.


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