it was shown that good accuracy and reproducibility can be attained using this method , which makes it possible to determine simultaneously nineteen amino acids : asx , thr , ser , glx , pro , cys , gly , ala , val , met , ile , leu , tyr , phe , his , lys and arg together with 4-hyp and hyl , specific amino acids found in collagen .
C0017890
gly
C0002520
amino acids