13 CODIS Core STR Loci

The choice of the 13 marker profile is the result of scientific research going back more than a decade. It was determined in the early 1980’s that there were locations in the human genome that are highly polymorphic. These locations (loci) contain many alleles detected initially as restriction fragment length polymorphisms (RFLPs) and later as short tandem repeats (STRs). Using population genetic principles, it was determined that a standard set of 13 genetically independent loci was sufficient to provide suitable information regarding biological relationships and to uniquely identify an individual (except for identical twins).

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