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|Noun||1.||suppressor gene - a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene)|
cistron, gene, factor - (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors"
tumor suppressor gene - a suppressor gene that blocks unscheduled cell division