Fig. 2
From: Local origin or external input: modern horse origin in East Asia
Three dimensional PCA of populations analyzed in the present study. a PC map of the 59 world horse populations based on haplogroup frequencies, for more details, see Table 1. b Plot of the haplogroup contribution of the first, second and third PCs. The contribution of each haplogroup was calculated as the factor scores for PC1, PC2 and PC3 with regression (REGR) method in SPSS