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why are there 20 different types of amino acids what are the 20 different types of amino acids there are 20 different types of amino acids that can be combined to make a protein why are there only 20 types of amino acids there are only 20 different types of amino acids why are there only 20 amino acids are there 20 or 21 amino acids what are the 20 types of amino acid why are there 20 amino acids
