currently these amino acids include : l-asparagine , l-aspartic acid , l-glutamine , l-cysteine ( cystine ) , l-methionine , l-arginine , l-histidine , l-tyrosine , l-phenylalanine , l-tryptophan , l-threonine , and l-serine .
C0002520
amino acids
C0017797
l-glutamine