J. Kaminski et al. Evolution of facial muscle anatomy in dogs. Proceedings of the National Academy of Sciences. Vol. 116, p. 14677, July 16, 2019. Doi: 10.1073/pnas.1820653116 ...

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Article #18-20653: "Evolution of facial muscle anatomy in dogs," by Juliane Kaminski, Bridget M. Waller, Rui Diogo, Adam Hartstone-Rose, and Anne M. Burrows.