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[1] [2] [3] Silk fibroin is considered a β-keratin related to proteins that form hair, skin, nails and connective tissues. Primary structure of fibroin, (Gly-Ser-Gly-Ala-Gly-Ala) n. The silk worm produces fibroin with three chains, the light, heavy, and the glycoprotein P25.
Keratin (/ ˈ k ɛr ə t ɪ n / [1] [2]) 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 layer of skin in vertebrates.
Sericin is composed of 18 different amino acids, of which 32% is serine.The secondary structure is usually a random coil, but it can also be easily converted into a β-sheet conformation, via repeated moisture absorption and mechanical stretching.
Natural skin care uses topical creams and lotions made of ingredients available in nature. [1] Much of the recent literature reviews plant-derived ingredients, which may include herbs, roots, flowers and essential oils, [2] [3] [4] but natural substances in skin care products include animal-derived products such as beeswax, and minerals.
Keratin is a structural protein located at the hard surfaces in many vertebrates. Keratin has two forms, α-keratin and β-keratin , that are found in different classes of chordates. The naming convention for these keratins follows that for protein structures: alpha keratin is helical and beta keratin is sheet-like.
Fibrous proteins consist of many families including keratin, collagen, elastin, fibrin or spidroin. Collagen is the most abundant of these proteins which exists in vertebrate connective tissue including tendon , cartilage , and bone .
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