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  • Molecular assay reagents intended for use in identifying a genetic abnormality known as loss of heterozygosity (LOH) in which one of the two copies of a given chromosomal region is lost in a subset of cells. LOH occurs in two forms: (1) copy-loss LOH, which typically involves deletion of a large chromosomal region (e.g., deletion of a chromosome arm) and (2) copy-neutral LOH, which typically involves gene conversion/mitotic recombination, in which DNA repair mechanisms result in the transfer of genetic sequence information from one chromosome copy to the other. These tests are typically used in the genetic analysis of tumor cells.
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