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Ancestral sisters as generators of mitochondrial sublineages are schematically illustrated. Mitochondrial (maternal) lineages are traced in thick, black lines, and a male consort of each mating is indicated by a short, thin line. The possessor of one stem-mitochondrial lineage at the top produced three daughters, and each of the three daughters, in turn, produced three granddaughters, thus initiating the diversification of the stem lineage into 13 sublineages.
