The cecal appendix is correlated with greater maximal longevity in mammals.

J Anat · 2021 · PMC8546507 · PMID 34235746

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highly significantno p-value reported

The highly significant heterogeneity in the evolutionary rate of the cecal appendix among mammal clades is both extreme and intriguing (Figures 2 and 3 ).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.