Fibril and hence the whole muscle. Elastin is a fibrous protein common in various soft tissues, like skin, blood vessels and lung tissue. Each monomer connects with each other, forming a 3D network, with ability to endure over 200% strain before deformation. Keratin is a structural protein mainly found in hair, nails, hooves, horns, quills. Basically keratin is formed by polypeptide chains, which coil into α-helices with sulfur cross-links or bond into β-sheets linked by hydrogen bonding. β-keratin, which is tougher than α-conformation, is more common in birds and reptiles. Resilin is an elastomeric insect protein, consisting of both α-helices and
Artificial nails nails are an extension, not a replacement, of natural nails. There are two main approaches to creating artificial nails—"tips" and "forms". Atop these, either acrylic, hard gel, or any combination of both may be applied. Tips are available in many different designs, ranging from solid colors like gel or regular nail polish to graphic designs such as animal prints and metallic colors. Artificial nails can be shaped, cut, and filed into a variety of shapes, including square, squared oval/"squoval", rounded, almond, ballerina/coffin, or stiletto. One popular material used to create acrylic nails is poly methyl methacrylate acrylic (PMMA). Mixing said