the reaction of the neurotoxin mptp ( 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine ) with monoamine oxidase from a variety of tissues including rat and monkey brain , bovine liver , and human placenta and platelets was found to yield , as a primary product , a reactive photosensitive substance with an absorbance maximum at 345 nm which is not the cation 1-methyl-4-phenylpyridinium ion previously reported as a monoamine oxidase-mptp metabolite in vivo and in vitro .
C0007447
cation
C0022023
ion