xmlns:atom="http://www.w3.org/2005/Atom"
2.
2. L-arginine
L-cystine
L-histidine
L-isoleucine
L-leucine
L-lysine
L-cysteine
L-methionine
L-phenylalanine
L-threonine
L-tryptophan
L-tyrosine
L-valine