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... of amplifying the Alu DNA nucleotide sequence found at the TPA25 (tissue plasminogen activator) locus on chromosome 8. The Alu insertion is also found on the ACE, PV92, APO, FXIIIB, D1, A25, and B65 loci, and is only present in primates. When testing for the insertion the genotypic results are either be homozygous positive (+/+, present in both alleles), homozygous negative (-/-, present in neither alleles) or heterozygous (+/-, present in one allele but not in the other). The Alu insertion is 300 base pairs in length and classified as short interspersed elements. There are between 500 and 2,000 restricted to the human genome. Alu DNA does not code for any protein, and is sometimes referred to as "selfish DNA," as it has no purpose other than to replicate itself. According to previous research, the frequency of having the Alu insertion is lowest in the African population, at 0.463. India ...