to investigate the considerable variation in stimulation of serum aminotransferase activities by pyridoxal-5'-phosphate added in vitro , we determined the pyridoxal-5'-phosphate content of plasma , using the tyrosine decarboxylase reaction together with the catalytic activities of alanine aminotransferase and aspartate aminotransferase , with and without pyridoxal-5'-phosphate supplementation , within a group of normal human individuals .
C0229671
serum
C0032105
plasma