the amino acids examined were l-alanine , l-arginine , l-asparagine , l-aspartic acid , l-cysteine , l-glutamic acid , l-glutamine , l-glycine , dl- and l-histidine , l-hydroxyproline , l-isoleucine , d- and l-leucine , l-lysine , l-methionine , dl- and l-phenylalanine , l-proline , l-serine , l-threonine , dl- , d- and l-tryptophan , l-tyrosine and d- and l-valine .
C0002520
amino acids
C0001898
l-alanine