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Gene duplication

The inherited appearance of multiple copies of a gene. Duplication may result in identical or defective copies, either as tandem repeats at the original chromosomal locus, at a neighbouring locus or at a completely different locus. Duplication may be benign or may be the basis of a pathology. If benign, one of the copies will be freed of any selective pressure and may evolve a new function. see gene amplification

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