amino acids, chemical structures: glycine, alanine, valine, leucine, isoleucine, serine, threonine, cysteine, methionine, proline

chemical structure amino acid 2d molecule protein peptide glycine alanine valine leucine isoleucine serine threonine cysteine methionine proline aspartic asparagine glutamic glutamine lysine arginine histidine phenylalanine tyrosine and tryptophan aspartate glutamate circle colored skeletal formula composition acids atoms atomic model molecular compound chemistry bond ring line drawing