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Nucleic Acids Research, 1979, Vol. 6, No. 7 2423-2434
© 1979

Articles

Conservation of sequences in related genomes of Apodemus: constraints on the maintenance of satellite DNA sequences

S.D.M. Brown and G.A. Dover

Department of Genetics, University of Cambridge Cambridge CB2 3EH, UK

Received March 19, 1979. Satellites from two related species of the Apodemus genus, A. sylvaticus and A. flavicollis, have been analysed with restriction enzymes Taq I, Alu I and Hind III. The restriction maps are closely conserved between species and show a novel feature of two differing internal periodicities within a 375 base pair repeating unit detected by two different restriction enzymes. This places constraints on the introduction of the observed restriction sites according to current models such as unequal crossing-over. The implications of such a conserved sequence and its presence in other species are discussed.


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