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Keratin
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Keratin is one of a family of structural fibrous proteins also known as scleroproteins. It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and the outer l
The horns of the impala are made of keratin covering a core of bone.
The horns of the impala are made of keratin covering a core of bone.
A human toenail that fell off after a small trauma.
A human toenail that fell off after a small trauma.
Protein sequence alignment of human keratin 1, 2A, 3,4, 5, 6A, 7, and 8 (KRT1 – KRT8). Only the first rod domain is shown above. Alignment was created
Protein sequence alignment of human keratin 1, 2A, 3,4, 5, 6A, 7, and 8 (KRT1 – KRT8). Only the first rod domain is shown above. Alignment was created using Clustal Omega.
Tetrapod
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A tetrapod is any vertebrate animal of the clade Tetrapoda. The main diagnostic and defining trait of tetrapods is having four limbs, connected to the shoulder- and pelvic girdles, for which the group
Keratin
…known as scleroproteins. It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and the outer layer of skin in tetrapod vertebrates. Keratin also protects epithelial cells from damage or stress. Keratin is extremely insoluble in water and organic solvents. Keratin monomers…
Tetrapoda
Tetrapoda
Eusthenopteron, ≈385 Ma
Eusthenopteron, ≈385 Ma
Tiktaalik, ≈375 Ma
Tiktaalik, ≈375 Ma
Acanthostega, ≈365 Ma
Acanthostega, ≈365 Ma