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A polymorphic Alu element belonging to a young subfamily of Alu repeats has been identified. Sequence analysis showed that thisAlu element is flanked by perfect direct repeats and a 3 oligo(dA)-rich tail. The Alu element, designated A25, is deleted by 34 nucleotides at the 5 end and has a single CpG mutation compared to the human-specific consensus sequence. Using a PCR-based assay, we demonstrated...