Blood-brain barrier and neuronal membrane transport of 6-[18F]fluoro-l-DOPA11Abbreviations: AAAD, aromatic l-amino acid decarboxylase; BBB, blood-brain barrier; BUI, brain uptake index; carbidopa, l-α-hydrazino-α-methyl-β-(3,4-dihydroxyphenyl)propionic acid; l-DOPA, l-3,4-dihydroxyphenylalanine; FDA, 6-fluorodopamine; [18F]FDOPA, 6-[18F]fluoro-l-3,4-dihydroxyphenylalanine; 4-[18F]FMT, 4-[18F]fluoro-l-meta-tyrosine; 6-[18F]FMT, 6-[18F]fluoro-l-meta-tyrosine; MeAIB, α-(methylamino)isobutyric acid; MPTP, 1-methyl-1,2,3,6-tetrahydropyridine; PD, Parkinson’s disease; PET, positron emission tomography; and PLP, pyridoxal phosphate.