Evidence that most human Alu sequences were inserted in a process that ceased about 30 million years ago.

Abstract excerpt

The primate Alu interspersed repeats can be subdivided into classes on the basis of shared nucleotides at a set of diagnostic positions. Each of the classes of Alu sequences is apparently the result of past retrotransposition of transcripts of highly conserved class-specific source genes that differed from each other at the diagnostic positions. The nucleotides at the majority of positions are identical among the...

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