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Molecular assay reagents intended for use in identifying the inborn (i.e., congenital) presence of three copies of chromosome 18 in a patient sample (e.g., fetal cells from amniotic fluid), rather than the normal two (i.e., trisomy 18). Trisomy 18 causes Edwards\' syndrome. Molecular tests for Edwards\' syndrome are typically used for prenatal diagnosis in pregnant women.
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