Alpha-Keratin is a type of protein that is a key structural component of hair, skin, and nails in mammals. It belongs to a family of proteins known as keratins, which provide strength and resilience. Alpha-keratin is characterized by its helical structure, allowing it to form durable fibers that protect cells and tissues. This protein is found in various forms across different species, contributing to the unique characteristics of their hair and skin. For example, the alpha-keratin in human hair differs from that in animal fur, affecting texture and appearance.