- Theanswerliesinthetinymitochondrialgenome.Researchersannouncedtodaythattheyhavesequencedthemitochondrialgenomeofanancientpolarbear.TheysequencedthemitochondrialgenomeofasinglehumanfingerfromaSiberiancave.Thebear'smitochondrialgenomeistheoldestoneyet...
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