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Mitochondrial DNA implies that nearly all modern dogs slide into 1 of four monophyletic haplogroups which happen to be named haplogroups A, B, C, and D. Virtually all dogs tumble inside haplogroup A. The mDNA "molecular clock" suggests that 22,800 YBP the first genetic divergence (break up) occurred in haplogroup A, resulting in the lineages A1b an