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"Oh yes," he replied, not looking up from the tests he was making. "Well, keratin, you know, is also called epidermose. It is a scleroprotein present largely in cuticular structures such as hair, nails, horn. I believe it is usually prepared from pieces of horn steeped in pepsin, hydrochloric acid, and water for a long time. Then the residue is dissolved in ammonia and acetic acid."
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