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Proteins consist of amino acids that conform to the following structure: R-CH(NH2)COOH
Amino acids contain an amino group, -NH2, and a carboxyl group, -COOH. Amino acids link to each when the carboxyl group of one molecule reacts with the amino group of another molecule, creating a peptide bond and releasing a molecule of water. Amino acids are the basic building blocks of enzymes, hormones, proteins and body tissues.