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 Of the 20 amino acids, proteins are unique chains made up of the 20 amino acids and can include 1000s of amino acids that function as miniature machines, doing the day-to-day work of the cell, such as maintenance, growth, and repair.

See also: Amino Acid, DNA (Deoxyribonucleic Acid), Ribosome, RNA (Ribonucleic Acid)