Fibrous protein
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Fibrous proteins, also called scleroproteins, are long filamentous protein molecules that form one of the two main classes of tertiary structure protein (the other being globular proteins). Fibrous proteins are only found in animals and are practically water-insoluble. This is due to hydrophobic R-groups which stick out of the molecule. They are usually used to construct connective tissues, tendons, bone matrix and muscle fibre.
Examples of fibrous proteins include keratins, collagens and elastins.