NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,034 terms related to cancer and medicine.

genetic marker
(jeh-NEH-tik MAR-ker)
A specific sequence of DNA at a known location on a chromosome. There are many genetic markers on each chromosome. Genetic markers and genes that are close to each other on a chromosome are usually inherited (passed from parent to child) together. This may help researchers find a gene near a marker that may cause a certain disease or trait within a family. Examples of genetic markers are single polymorphism nucleotides (SNPs) and microsatellites.