Pipecolic acid (PA) is the major metabolic intermediate of lysine in the mammalian brain. Lysine degradation may occur in mitochondria by a bifunctional enzyme complex α-aminoadipic semialdehyde synthase through its lysine-ketoglutarate reductase and saccharopine dehydrogenase activities. Pipecolic Acid https://www.creative-proteomics.com/services/pipecolic-acid-analysis-service.htm