These are the structures for the twenty natural amino acids, plus the general structure for an amino acid.
 Amino Acid General Structure |  Alanine |  Arginine |  Asparagine |
 Aspartic Acid |  Cysteine |  Glutamic Acid |  Glutamine |
 Glycine |  Histidine |  Isoleucine |  Leucine |
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