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To calculate runs of homozygosity (ROH) in our samples, we used the default parameters in PLINK. To avoid the effects of different sample sizes on calculations, we used the same 48-subject groups (Turkish, European, Middle Eastern, Central Asian, South Asian and Northeast Asian). To eliminate the effect of LD on detection of ROHs, SNPs were LD pruned http://www.selleck.cn/products/sch772984.html (r2 http://www.selleckchem.com/products/obeticholic-acid.html region clustered among themselves. Turkish samples clustered tightly among themselves and together with Europeans, Middle Easterners and South Asians (Pakistani). Krygyz samples also clustered tightly among themselves and between Central Asians (Uygur and Hazara) and East Asians. To examine fine-scale population structure and relatedness, we removed African, Oceanian and native American populations. Representative populations from Eurasia were selected, and the analysis was repeated (Fig. 2B). Turkish samples clustered with Middle Eastern and European populations, particularly with the Adygei population from the Caucasus. South Asian populations clustered separately and did not overlap with Turkish samples. Kyrgyz samples clustered with other Central Asian populations, but they were relatively closer to East Asian populations (Fig. 2B). These results demonstrate that the PC analysis for the Eurasian region clearly delineates fine-scale population structure. To examine finer-scale population clustering among populations and to identify any subpopulation structure among our subjects from different regions of Turkey, we analysed Turkish samples together with European and Middle Eastern populations (Fig. 3A) or with South Asian and Central Asian populations (including http://www.selleckchem.com/products/Adriamycin.html Kyrgyz) (Fig. 3B) after examining the pattern of clustering of populations in Figures 2A and B. The Turkish samples were easily separated from the Middle Eastern and European populations, and to some extent from the Adygei population. Importantly, samples from the three regions in Turkey (Aydin, Istanbul and Kayseri) overlapped, suggesting no clear subpopulation structure in our samples (Fig. 3A). Additional pairwise PCs were plotted using Turkish, European and Middle Eastern populations. The third PC clearly distinguished Middle Eastern populations of Palestinians and Druze (Figs. S1A and C), while the Turkish samples from different regions overlapped (Figs. S1A�CD).