Mammals' complex teeth may have evolved twice, on either side of a great divide.
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Luo,Z.-X.,Cifelli, R.L. & Kielan-Jaworowska, Z. Dual origin of tribosphenic mammals. Nature 409, 53 - 57.
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Shackleton, J. Poles apart, molars together. Nature (2001). https://doi.org/10.1038/news010104-5