 15 citations
,
  July 2004   in “Journal of morphology”
           15 citations
,
  July 2004   in “Journal of morphology”    Monotreme hair structure and protein distribution are similar to other mammals, but their inner root sheath cornifies differently, suggesting a unique evolution from reptile skin.  
      17 citations
,
  June 2012   in “Journal of experimental zoology. Part B, Molecular and developmental evolution”
           17 citations
,
  June 2012   in “Journal of experimental zoology. Part B, Molecular and developmental evolution”    Hair in mammals likely evolved from glandular structures, not scales.  
               86 citations
,
  April 2009   in “Journal of anatomy”    Hard skin features like scales, feathers, and hair evolved through specific protein changes in different animal groups.  
               4 citations
,
  June 2023   in “Journal of developmental biology”    The skin systems of jawed vertebrates evolved diverse appendages like hair and scales from a common structure over 420 million years ago.  
               65 citations
,
  September 2014   in “BMC genomics”    Different hair types in mammals are linked to variations in specific protein genes, with changes influenced by their living environments.