similar results were obtained for l-alanine , l-arginine , l-asparagine , l-aspartic acid , l-cystine , l-glutamic acid , l-glutamine , l-histidine , l-lysine , l-phenylalanine , l-proline , l-serine , and l-tyrosine .
C0061472
l-glutamic acid
C0017797
l-glutamine