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Alu elements are non-autonomous retrotransposons present in high number of copies in primate genomes. In the human genome, these repetitive sequences are interspersed on all chromosomes with more than one million copies. Thanks to their genome-wide distribution, Alu elements can be used as target loci to perform a PCR-based genome fingerprinting.
The method is characterised by an high information level compared to other DNA fingerprint techniques.