Compléter Nail CompositionVersion en ligne Take this quick quiz to see if you remember what you read. par Rosalind Carter 1 keratin flexible onyx firm integumentary rigid 15 25 The natural nail is part of the system . The is the hard protective plate composed mostly of . A normal healthy nail is but . The water content of a nail is between and percent . The lower the water content , the more the nail .
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