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Noun
gene
cistron
factor
Definition: (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"
Definition: The unit of hereditary material (e.g. DNA) that encodes one protein; sometimes used interchangeably with the word gene.