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Mitochondrial DNA signifies that just about all present day dogs drop into 1 of four monophyletic haplogroups which can be named haplogroups A, B, C, and D. Many dogs slide within haplogroup A. The mDNA "molecular clock" suggests that 22,800 YBP the main genetic divergence (break up) happened in haplogroup A, causing the lineages A1b and A2. This t