the following 14 amino acids were shown to be essential for the full development of the egg in the medium : l-arginine , l-cystine , glycine , l-histidine , l-isoleucine , l-leucine , l-lysine , l-methionine , l-phenylalanine , l-serine , l-threonine , l-tryptophan , l-tyrosine , and l-valine .
C0002520
amino
C0017890
glycine