PhylogenyPaleodontologyFossilsEvolution, MolecularBayes TheoremBiological EvolutionLikelihood FunctionsGenes, MitochondrialDNA, MitochondrialGenetic SpeciationSequence Analysis, DNAModels, GeneticSpecies SpecificityGeographyMolecular Sequence DataGenetic VariationSequence AlignmentBase SequenceTime FactorsModels, BiologicalRats, Sprague-DawleyMutationCells, Cultured