Locus - Definition

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In the field of genetics, the locus is defined as being the precise localization of a gene on a chromosome. A gene is composed of deoxyribonucleic acid (DNA), whose fundamental role is to transmit hereditary information of living beings. In anatomy, the locus corresponds to the anatomical location found in nerve structures which are detailed within the nomenclature "parisiensa nomina anatomica" (PNA). The locus niger is the most well-known example of a locus. This strip of gray substance is implanted in the cerebral peduncle. It takes part in the regulation of automatic movements. Those with Parkinson's disease suffer from a lesion of the locus niger.