AADC, aromatic l-amino acid decarboxylase

AAAH, aromatic amino acid hydroxylases

ATP, adenosine triphosphate

BCKDC, branched-chain α-ketoacid dehydrogenase complex

BH2, dihydrobiopterin

BH4, tetrahydrobiopterin

CBS, cystathionine beta synthase

CGL, cystathionine gamma-lyase

CoA, coenzyme A

CS, citrate synthase

DHFR, dihydrofolate reductase

dTMP, thymidine monophosphate

dUMP, deoxyuridine monophosphate

EEG, electroencephalography

EGRAC, erythrocyte glutathione reductase activation test

FAD/FADH2, flavin adenine dinucleotide (oxidised/reduced)

fMRI, functional magnetic resonance imaging

GABA, gamma-aminobutyric acid

GSSG, glutathione disulphide

IDH, isocitrate dehydrogenase

MAT, methionine adenosyltransferase

MDH, malate dehydrogenase

MCM, methylmalonyl-CoA mutase

MMSE, Mini Mental State Exam

MS, methionine synthase

MTHFR, methyltetrahydrofolate reductase

MTRR, methionine synthase reductase

NAD, nicotinamide adenine dinucleotide (+/H = oxidised/reduced)

NIACR, Niacin receptor

NOS, nitric oxide synthase

OGDH, α-ketoglutarate dehydrogenase

PCC, propionyl-CoA Carboxylase

PC, pyruvate carboxylase

PD, pyruvate dehydrogenase

RDA, Recommended Daily Allowance

RDI, Recommended Daily Intake

SAH, S-adenosylhomocysteine

SAHH, S-adenosylhomocysteine hydrolase

SAM, S-adenosyl methionine

SCS, succinyl-CoA synthetase

SH, serine hydroxymethyltransferase

SQR, succinate-coenzyme Q reductase

THF, tetrahydrofolate

TS, thymidylate synthase