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Organic compound which forms the building blocks of proteins; each amino acid contains an identical amino group, a carboxylic acid group, and a carbon atom--they differ only by a side chain of atoms called a remainder group (R group), which gives each amino acid its identity; there are 20 common amino acids.

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1. Organic compound which forms the building blocks of proteins; each amino acid contains an identical amino group, a carboxylic acid group, and a carbon atom--they differ only by a side chain of atoms called a remainder group (R group), which gives each amino acid its identity; there are 20 common amino acids.





 
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