Protein is an important component of every cell in the body. Hair and nails are mostly made of protein. Your body uses protein to build and repair tissues. You also use protein to make enzymes, hormones, and other body chemicals. Protein is an important building block of bones, muscles, cartilage, skin, and blood.
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A peptide bond is a chemical
bond formed between two
molecules when the carboxyl
group of one molecule reacts
with the amino group of the
other molecule, releasing a
molecule of water (H2O).
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