[Answer] What are human fingernails made of?

Step 1 : Introduction to the question "What are human fingernails made of?"

...Human fingernails and toenails form from the same type of protein called keratin. This form of protein also helps in the formation of hair and skin cells, as well as some internal glands and the linings of certain organs. The part of the nails that we can see is actually dead. The growing part of the nail is under the skin at the base of the nail. As new cells form and grow, they push the old ones out through the skin. Because the nail itself consists of dead cells it doesn't hurt to trim the nails. The tiny blood vessels, called capillaries, under the sheet of nail gives them their normal pink color. Source: Healthline.com

Step 2 : Answer to the question "What are human fingernails made of?"

Keratin:

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