in vitro incubation of rat pancreatic lobules in the presence of 10 mm concentrations of 2 natural ( phenylalanine , tryptophane ) and 2 modified aromatic amino acids ( p-fluorophenylalanine , p-chlorophenylalanine ) induces paracrystal formation in the cisternal space of the rough endoplasmic reticulum and in the acinar lumen .
C0031453
phenylalanine
C0030135
p-chlorophenylalanine