the incorporation of suitable c ( 14 ) -labeled amino acids into gramicidin and tyrocidine was studied several analogues of tyrocidine amino acids ( beta-hydroxyglutamic acid , pipecolic acid , beta-2-thienylalanine , p-fluorophenylalanine , and phenyl glycine ) selectively reduced tyrocidine synthesis , when added to the nutrient medium .
C0002520
amino
C0017890
glycine