our results do not support previous findings from other authors on an endogenous origin of piperidine in brain from cadaverine and pipecolic acid , and they suggest that a ) cadaverine is not a precursor of piperidine in brain , b ) the conversion of pipecolic acid into piperidine in the brain does not constitute a major metabolic pathway , and c ) the main source of piperidine in the cns may be of nonneural origin .
C0006104
brain
C3714787
cns