Oldest mammalian DNA sequence reveals link to brown bears.
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Lindqvist, C. et al. Proc. Natl Acad. Sci. USA advance online publication doi:10.1073/pnas.0914266107 (2010).
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Kaplan, M. Ancient polar-bear fossil yields genome. Nature (2010). https://doi.org/10.1038/news.2010.99