Hello Shakoor Ali

Wool is composed of approximately 95% keratin, which can be broadly divided into three protein classes. The intermediate filament proteins are typically of high molecular weight (45-60 kD), with a partly fibrillar tertiary structure and a cysteine content of the order of 6%. They account for approximately 58% of the wool fibre by mass although only part of this mass is actually helix-forming in structure.

The high- and ultra-high-sulphur proteins, approximately 26% of the wool fibre, are globular in structure, have a molecular weight range of 10-40 kD and can contain cysteine levels up to 30 mol %.

The high-glycine-tyrosine proteins are a minor class comprising 6% of the wool fibre, have molecular weights of the order of 10 kD and are characterized by their high content of glycine and tyrosine amino acid residues.

For more information you may want to refer to the link below.

https://patents.google.com/patent/US20090069541A1/en

Best.