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Fifteen autosomal STR loci (D3S1358, TH01, D21S11, D18S51, Penta E, D5S818, D13S317, D7S820, D16S539, CSF1PO, Penta D, VWA, D8S1179, TPOX, and FGA) were studied in three geographically close but isolated populations from the Bosnian mountain area. The three villages are Bobovica, Dejcici, and Lukomir. DNA was obtained from 83 individuals, and the allele frequencies and genetic diversity among the three sample groups were compared. In addition, seven of the STR loci (CSF1PO, D13S317, D3S1358, D5S818, D7S820, FGA, TH01) were used in a compar- ative population analysis of the Bjelasˇnica–Treskavica region and the Adri- atic islands of Brac, Hvar, and Korcula. Although the sample sizes are relatively small, the observed variation within any of the small isolated popu- lations is high and comparable to less isolated groups. In addition, even though the populations are geographically isolated, the STR data are similar among the populations. The most significant frequency differences were ob- served at the TH01 locus. Although the specific allele distributions in any untyped population cannot be determined a priori, we find support for a high degree of diversity for the STR loci in most populations. In addition, the multiple locus profile is highly informative not only for various population studies but also for forensic studies, even when specific population data are not available.