Fur is a defining feature of being a mammal.
Despite these differences, Kowalczyk and colleagues found the genetic changes in furless species mostly arose from mutations in the same sets of genes.
"As animals are under evolutionary pressure to lose hair, the genes encoding hair become less important," University of Pittsburgh geneticist Clark Nathan"That's why they speed up the rate of genetic changes that are permitted by natural selection. Some genetic changes might be responsible for loss of hair. Others could be collateral damage after hair stops growing."
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