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Mitochondrial DNA implies that nearly all contemporary dogs fall into just one of 4 monophyletic haplogroups which can be named haplogroups A, B, C, and D. Virtually all dogs drop within haplogroup A. The mDNA "molecular clock" implies that 22,800 YBP the 1st genetic divergence (split) occurred in haplogroup A, leading to the lineages A1b and A2. T