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For example, silk is made of fibroin. But what's wool made of?

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Unlike silk or cotton, wool does not have a homogeneous structure. Its core is considered to be made of keratin, a generic type of protein found in human hair and epidermis. A detailed PDF on Merino wool can be downloaded from here.

Thanks for encouraging me, through your question, to read that PDF, which explains both the chemical and physical properties in a straight-forward fashion.

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