title: Evolutionary biology. Ancient DNA untangles evolutionary paths.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Pennisi
mesh_terms: D000818:Animals; D000864:Antarctic Regions; D001717:Birds / Q000097:blood / Q000235:genetics*; D001842:Bone and Bones / Q000378:metabolism; D004272:DNA, Mitochondrial / Q000235:genetics* / Q000302:isolation & purification; D004641:Emigration and Immigration; D019143:Evolution, Molecular; D005580:Fossils; D014644:Genetic Variation / Q000235:genetics; D007053:Ice; D016296:Mutagenesis / Q000235:genetics; D010802:Phylogeny; D012800:Siberia; D013997:Time Factors; D001503:Ursidae / Q000235:genetics*
chemical_list: D004272:DNA, Mitochondrial; D007053:Ice