PCA and ADMIXTURE analysis of eight populations. a A map of eight populations analyzed in this study. AN: AN-speaking population. NAN: NAN-speaking population. b PCA plot for the eight populations. c Results of ADMIXTURE analysis for K ranging from 2 to 6. The lowest cross-validation error was obtained for K = 5. The map depicted in Fig. 1 (a) was taken from FREEWORLDMAP.NET (https://www.freeworldmaps.net/). 1 Tongans obtained from Kimura et al. . 2Tongans obtained from Qin and Stoneking  and Pugach et al.