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We have isolated and characterized a family of interspersed repetitive elements which make up about 1% of the mouse genome. The elements represent a group of homologous but non-identical units about 400 bp in length. Individual members of the family show considerable divergence from one another. The spacial relationships between members of the family and a number of other identified mouse sequences including structural genes have been determined; these elements are found on the 5' as well as 3' sides of various genes at distances ranging from less than 1 to 7.5 kilobases (Kb). The sequences are present in the DNA of all species of Mus. Related sequences are present in the rat genome at a repetition frequency similar to that in the mouse genome. A partial sequence of one member of the family is presented.
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Lueders et al. (1982) studied this question.
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