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
Black Is the Color (of My True Love's Hair) Black Is the Color (of My True Love's Hair) "Black Is the Color (of My True Love's Hair)" (Roud 3103) is a traditional folk song first known in the US in the Appalachian Mountains but originating from Scotland, as attributed to the reference to the Clyde in the song's lyrics. The musicologist Alan Lomax supported this Scottish origin, saying that the song was an American "re-make of British materials." Many different versions of this song exist, some addressed to females and others addressed to males, as well as other differences: These words are set to two distinct melodies, one of