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. 2016 Jul 28;6:30532. doi: 10.1038/srep30532

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Plus/minus one standard deviation is indicated by error bars. *Human angles are significantly different from both bipedal and quadrupedal chimpanzee angles (Mann-Whitney U test, P < 0.001). ⁺Chimpanzee bipedal and quadrupedal angles are significantly different from one another (Mann-Whitney U test, P = 0.001).