NCI: The position of a gene or a chromosomal marker on a chromosome; also, a stretch of DNA at a particular place on a particular chromosome. The use of locus is sometimes restricted to mean regions of DNA that are expressed.,NCI: The physical site or location of a specific gene on a chromosome.,HL7V3.0: <p><b>Description:</b>The position of a gene (or other significant sequence) on the genome.</p>

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