the pif-active substance was isolated and identified as gamma-amino-butyric acid ( gaba ) by : 1 ) amino acid analyses using sodium as well as lithium-based buffers for resolution of biological fluids , 2 ) thin-layer chromatography of underivatized material as well as phenylthiocarbamyl derivatives , and 3 ) mass spectroscopy .
C0439861
substance
C0005889
fluids