in glands with a natural blood supply , umax values up to 46 % were measured for short-chain ( serine and alanine ) and long-chain ( valine , methionine , leucine , isoleucine , 1-amino-cyclopentane cyclopentane carboxylic acid , phenylalanine , tryptophan , tyrosine , histidine and glutamine ) neutral amino acids .
C0036720
serine
C0301715
neutral amino acids