Alpha-keratin Alpha-keratin Alpha-keratin, or α-keratin, is a type of keratin found in mammals. This protein is the primary component in hairs, horns, nails and the epidermis layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure. The secondary structure of α-keratin is very similar to that of a traditional protein α-helix and forms a coiled coil. Due to its tightly wound structure, it can function as one of the strongest biological materials and has various uses in mammals, from predatory claws to hair for warmth. α-keratin is
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