What's In a Nail and How Fast Do They Grow?
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|Mon, 04-09-2012 - 10:45am|
Like your hair, nails are comprised of dead cells that make up a protein called keratin. The hardness of the nail comes from the presence of sulfur in the amino acids binding the keratin of the nails together. Between the layers of keratin are fat and water molecules that make nails shiny and pliable.