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Proteins are built up from individual amino acids to form long chains where each amino acid is a link in the chain. nails Two amino acids are nails joined together by a "peptide bond", and the correct number of amino acids placed in their correct order will form a specific protein; i.e. keratin, collagen, elastin, and nails so on. The keratin found in human hair is also a major protein in fingernails. Three layers of keratin form every hair. The outer sheath of cuticle forms overlapping scales. Hair proteins have a high sulfur content from the amino acid cysteine which can easily form cross-links to other cystines in the hair molecule. These bonds are responsible for the hair's toughness and abrasion resistance and the cross-links hold the hair fibers together.
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