![](http://www.alamy.com/thumbs/6/A78B80FC-FDDF-41D8-8E7C-43F0F1872BFB/2H7AJGB.jpg)
Three dimensional structures of the twenty amino acids.
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Photo credit: © Todd Bannor / Alamy / Afripics
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Keywords: acid, alanine, amino, arginine, asparagine, aspartic, biochemistry, blocks, building, chemical, chemistry, cysteine, formula, glutamic, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, molecule, molecules, organic, phenylalanine, polypeptide, proline, protein, serine, structure, threonine, tryptophan, tyrosine, valine