You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Substance common in skin and hair is? and explain in detail?
Ans. is 'a' i.e., Keratin * Keratin is a family of fibrous structural proteins. Keratin is the protein that protects epithelial cells from damage or stress.* Keratin is the key component of our skin, hair and nails. Its protein building blocks have amino acid chains, coiled, cross-linked and classified as either hard or soft.* The soft a-keratins are found in the hair, stratum corneum & nails* The harder b-keratins are found in nails.* Internal linkages provide keratin with its stability, enzyme resistance and insolubility (although it can absorb water).* Keratin monomers assemble into bundles to form intermediate filaments.* Keratin filaments are abundant in keratinocytes in the cornified layer of the epidermis