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- Beta-keratin abstract "β-keratin or beta-keratin is a protein in the keratin family. β-keratin is rich in stacked β pleated sheets, in contrast to alpha-keratin, a fibrous protein rich in alpha helices.β-keratin is found in reptiles. It adds much more rigidity to reptilian skin than alpha-keratin does to mammalian skin.β-keratin is impregnated into the stratum corneum of the reptilian skin, providing waterproofing and the prevention of desiccation.In birds, scales, beaks, claws and feathers also contain β-keratin of the avian family. Phylogenetic studies of β-keratin sequences show that feather β-keratins evolved from scale β-keratins. The scale β-keratins form the basal group in avians. Duplication and divergence events then led to claw β-keratin genes, and further recombination resulted in new feather and feather-like avian β-keratin genes. Evidence for these duplication events comes from the correlation of feather β-keratin clade structure with their genomic loci.Changes in β-keratins may have also influenced the development of powered flight. A recent study using molecular dating methods to link the evolution of β-keratin genes to that of feathers reveals that the avian β-keratin family began diverging from the crocodile family about 216 million years ago. But the feather β-keratin family did not begin diverging until 125 million years ago, a date consistent with the adaptive radiation of birds during the Cretaceous. β-keratins found in modern feathers have increased elasticity, a factor that may have contributed to their role in flight. Thus, the feathered ancestors of birds including Anchiornis and Archaeopteryx, whose flight capabilities have been questioned, would have had avian, but not feather β-keratins.The small alvarezsaurid dinosaur Shuvuuia deserti showed evidence of a featherlike skin covering. Analysis by Schweitzer et al. (1999) showed that these featherlike structures consisted of beta-keratin.".
- Beta-keratin wikiPageID "1066195".
- Beta-keratin wikiPageLength "6254".
- Beta-keratin wikiPageOutDegree "21".
- Beta-keratin wikiPageRevisionID "668942374".
- Beta-keratin wikiPageWikiLink Alpha-keratin.
- Beta-keratin wikiPageWikiLink Alpha_helices.
- Beta-keratin wikiPageWikiLink Alpha_helix.
- Beta-keratin wikiPageWikiLink Alvarezsaurid.
- Beta-keratin wikiPageWikiLink Alvarezsauridae.
- Beta-keratin wikiPageWikiLink Anchiornis.
- Beta-keratin wikiPageWikiLink Archaeopteryx.
- Beta-keratin wikiPageWikiLink Beak.
- Beta-keratin wikiPageWikiLink Beaks.
- Beta-keratin wikiPageWikiLink Beta_sheet.
- Beta-keratin wikiPageWikiLink Category:Keratins.
- Beta-keratin wikiPageWikiLink Claw.
- Beta-keratin wikiPageWikiLink Claws.
- Beta-keratin wikiPageWikiLink Desiccation.
- Beta-keratin wikiPageWikiLink Dinosaur.
- Beta-keratin wikiPageWikiLink Feather.
- Beta-keratin wikiPageWikiLink Feathered_dinosaur.
- Beta-keratin wikiPageWikiLink Feathered_dinosaurs.
- Beta-keratin wikiPageWikiLink Feathers.
- Beta-keratin wikiPageWikiLink Keratin.
- Beta-keratin wikiPageWikiLink Mammal.
- Beta-keratin wikiPageWikiLink Protein.
- Beta-keratin wikiPageWikiLink Reptile.
- Beta-keratin wikiPageWikiLink Scale_(anatomy).
- Beta-keratin wikiPageWikiLink Shuvuuia.
- Beta-keratin wikiPageWikiLink Shuvuuia_deserti.
- Beta-keratin wikiPageWikiLink Stratum_corneum.
- Beta-keratin wikiPageWikiLink Waterproofing.
- Beta-keratin wikiPageWikiLink Β_pleated_sheets.
- Beta-keratin wikiPageWikiLinkText "Beta-keratin".
- Beta-keratin wikiPageWikiLinkText "beta-keratin".
- Beta-keratin wikiPageWikiLinkText "β-keratin".
- Beta-keratin hasPhotoCollection Beta-keratin.
- Beta-keratin wikiPageUsesTemplate Template:Cytoskeletal_proteins.
- Beta-keratin wikiPageUsesTemplate Template:Distinguish.
- Beta-keratin wikiPageUsesTemplate Template:MeshName.
- Beta-keratin wikiPageUsesTemplate Template:Reflist.
- Beta-keratin subject Category:Keratins.
- Beta-keratin hypernym Protein.
- Beta-keratin type Article.
- Beta-keratin type Protein.
- Beta-keratin type Article.
- Beta-keratin type Thing.
- Beta-keratin comment "β-keratin or beta-keratin is a protein in the keratin family. β-keratin is rich in stacked β pleated sheets, in contrast to alpha-keratin, a fibrous protein rich in alpha helices.β-keratin is found in reptiles.".
- Beta-keratin label "Beta-keratin".
- Beta-keratin differentFrom Beta-Carotene.
- Beta-keratin sameAs Kératine_bêta.
- Beta-keratin sameAs m.042_qw.
- Beta-keratin sameAs Q2930097.
- Beta-keratin sameAs Q2930097.
- Beta-keratin wasDerivedFrom Beta-keratin?oldid=668942374.
- Beta-keratin isPrimaryTopicOf Beta-keratin.