They also have a large proportion of cysteine residues which form disulfide bonds.
In squamous cell carcinomas, layers of these proteins form concentric rings resulting in a structure called a namesake "pearl." A fragile skin that is extremely sensitive to pressure is characteristic of Epidermolysis Bullosa Simplex, which is often caused by mutations in genes for these proteins. Leucine and glycine are prevalent in the helix-forming alpha forms of these proteins, and most of these proteins are made of an acidic chain and a neutral chain. They also have a large proportion of cysteine residues which form disulfide bonds. For 10 points, identify these proteins which are found in dead tissue such as hair and nails.
In squamous cell carcinomas, layers of these proteins form concentric rings resulting in a structure called a namesake "pearl."
{keratin}