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Hair Biology
Hair consists 90% of α-helically coiled protein – α-keratin, and about 10% water, which modifies its mechanical properties. α-keratins form long protofibrils of about 100 µm in length and 3 µm in width. Many of these protofribrils associate to form one strand of hair, which is covered with cuticle scales. The end of each keratin chain is high in the amino acids proline and cysteine. Adjacent keratin chains are strongly linked by robust disulfide bonds.

Hair growth is a continuous process - hair generation and shedding follow back to back in a cycle. Sometimes the process is accompanied by hair loss or new hair generation. Typically, the life cycle of hair consists of three key phases:


1. Anagen (Growth Phase)
2. Catagen (Transitional Phase)
3. Telogen (Resting Phase)