an oxidized electron donor
a reduced electron donor
a deaminated amino group acceptor
an aminated amino group acceptor
Charged-LEU-tRNAs
LEU-tRNAs
a 2-oxo acid
an amino acid
an acyl-CoA
a carboxylate
an oxidized ferredoxin [iron-sulfur] cluster
a reduced ferredoxin [iron-sulfur] cluster
NAD(P)H
NAD(P)+
an L-tyrosyl-[tRNAtyr]
a tRNAtyr
(2Z,4Z)-2-hydroxy-5-carboxymuconate-6-semialdehyde
4α,14α-dimethyl-porifersta-8,25(27)-dienol
2-amino-4,5-dihydroxy-6-oxo-7-(phosphooxy)heptanoate
4-methylcyclohex-1,5-diene-1-carbonyl-CoA
isoshowacene
2-hydroxyhexadecanal
16-sinapoyloxypalmitate
3-methylquinolin-2-ol
(22R)-hydroxycholesterol
N-(2-methylpropyl)hydroxylamine
chloroeremomycin
3-hydroxy-3-methylbutanoate
2',3',4'-O-methyl-rhamnosyl tetracyclic spinosyn pseudoaglycone
2',3'-O-methyl-rhamnosyl tetracyclic spinosyn pseudoaglycone
2'-O-methyl-rhamnosyl tetracyclic spinosyn pseudoaglycone
rhamnosyl tetracyclic spinosyn pseudoaglycone
rhamnosyl tricyclic spinosyn pseudoaglycone
spinosyn tricyclic macrolactone
11-dehydro-15-oxo spinosyn macrolactone
15-oxo spinosyn macrolactone
spinosyn macrolactone
diethylamine N-oxide
triethylamine N-oxide
UDP-2-acetamido-2-deoxy-α-D-ribo-hex-3-uluronate
nitroxyl
trans,octacis-decaprenylphospho-β-D-arabinofuranose
1,3-dihydro-2H-imidazol-2-one
2-phenylethyl β-D-glucopyranoside
formyl hopane
ribosyl hopane
adenosyl hopane
(2Z)-2-hydroxypenta-2,4-dienoate
(2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinate
(2Z)-2,4-dihydroxypent-2-enoate
(2E,7Z,10Z,13Z,16Z,19Z)-docosahexaenoyl-CoA
(3R,5Z,8Z,11Z,14Z,17Z)-3-hydroxydocosapentaenoyl-CoA
(5Z,8Z,11Z,14Z,17Z)-3-oxodocosapentaenoyl-CoA
(+)-3'-hydroxylarreatricin
(+)-larreatricin
2-trans,4-trans-xanthoxin
(2Z)-2-(acetamidomethylene)succinate
3-hydroxy-2-methylpyridine-5-carboxylate
3-hydroxy-2-methylpyridine-4,5-dicarboxylate
5-formyl-3-hydroxy-2-methylpyridine-4-carboxylate
D-glycero-β-D-manno-heptose 1,7-bisphosphate
D-glycero-β-D-manno-heptose 1-phosphate
(R)-pantothenate
(R)-4'-phosphopantothenate
D-erythro-imidazole-glycerol-phosphate
histidinol
histidinal
2-phosphoglycolate
glycolate
D-gluconate 6-phosphate
lipid X
lipid A disaccharide (E. coli)
2-iminoacetate
4-amino-2-methyl-5-pyrimidinemethanol
4-amino-2-methyl-5-(phosphooxymethyl)pyrimidine
4-amino-2-methyl-5-(diphosphooxymethyl)pyrimidine
hydroxylamine
carbamoyl phosphate
5-amino-6-(5-phospho-D-ribitylamino)uracil
5-amino-6-(5-phospho-D-ribosylamino)uracil
ethanolamine
1,4-dihydroxy-2-naphthoate
xanthine
succinate semialdehyde
coproporphyrinogen III
(R)-4'-phosphopantothenoyl-L-cysteine
4-amino-4-deoxychorismate
glutathionylspermidine
2-oleoylglycerol
lipid IVA
4'-phosphopantetheine
ammonia
selenophosphate
carbon monoxide
(L-threonylcarbamoyl)adenylate
acetyl phosphate
oxalosuccinate
citrate
urea
2-(α-hydroxyethyl)thiamine diphosphate
glycerone phosphate
γ-L-glutamyl 5-phosphate
S-ribosyl-L-homocysteine
autoinducer 2
(R)-2,3-dihydroxy-3-methylpentanoate
(S)-3-methyl-2-oxopentanoate
3-phosphooxypyruvate
2-C-methyl-D-erythritol 4-phosphate
L-canavanine
ADP-D-glycero-β-D-manno-heptose
ADP-L-glycero-β-D-manno-heptose
orotidine 5'-phosphate
2-(formamido)-N1-(5-phospho-β-D-ribosyl)acetamidine
N2-formyl-N1-(5-phospho-β-D-ribosyl)glycinamide
thiamine phosphate
thiamine diphosphate
1-deoxy-L-glycero-tetrulose 4-phosphate
carbonic acid
2,5-diamino-6-(5-phospho-D-ribosylamino)pyrimidin-4(3H)-one
(S)-dihydroorotate
5-amino-1-(5-phospho-β-D-ribosyl)imidazole
N5-carboxyaminoimidazole ribonucleotide
phthalate
2,2'-disulfonyl azobenzene
3-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]benzenesulfonate
H2
6-phospho D-glucono-1,5-lactone
α-D-glucosamine 1-phosphate
4-(β-D-ribofuranosyl)aminobenzene-5'-phosphate
pimeloyl-CoA
S-adenosyl-4-methylsulfanyl-2-oxobutanoate
8-amino-7-oxononanoate
(S)-2-amino-6-oxohexanoate
3-deoxy-D-manno-octulosonate 8-phosphate
(indol-3-yl)pyruvate
(S)-2-acetolactate
(S)-2-aceto-2-hydroxybutanoate
5-enolpyruvoyl-shikimate 3-phosphate
5-amino-6-(D-ribitylamino)uracil
(S)-2,3,4,5-tetrahydrodipicolinate
N-succinyl-2-amino-6-ketopimelate
oxaloacetate
N-acetyl-α-D-glucosaminyldiphospho-ditrans,octacis-undecaprenol
5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate
5'-phosphoribosyl-4-(N-succinocarboxamide)-5-aminoimidazole
L-arginino-succinate
O-ureido-L-homoserine
canavaninosuccinate
urea-1-carboxylate
2-C-methyl-D-erythritol-2,4-cyclodiphosphate
3-deoxy-α-D-manno-2-octulosonate
2-dehydro-3-deoxy-D-gluconate
2-dehydro-3-deoxy-D-gluconate 6-phosphate
imidazole acetol-phosphate
L-histidinol phosphate
N-(5-phosphoribosyl)-anthranilate
anthranilate
N-succinyl-L,L-2,6-diaminopimelate
(5Z,8Z,11Z,14Z,17Z)-icosapentaenoyl-CoA
N-acetyl-D-muramate 6-phosphate
3-dehydroshikimate
(1R,6R)-6-hydroxy-2-succinylcyclohexa-2,4-diene-1-carboxylate
2-succinylbenzoate
4-(2'-carboxyphenyl)-4-oxobutyryl-CoA
1,4-dihydroxy-2-naphthoyl-CoA
core oligosaccharide-lipid A (E. coli K-12 core type)
prenyl diphosphate
(E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate
arsenite
7,8-diaminopelargonate
dethiobiotin
shikimate
shikimate 3-phosphate
3-deoxy-D-arabino-heptulosonate 7-phosphate
3-dehydroquinate
hydrogen selenide
O-acetyl-L-serine
hydrogen peroxide
isopentenyl diphosphate
isochorismate
2-succinyl-5-enolpyruvoyl-6-hydroxy-3-cyclohexene-1-carboxylate
5-phospho-β-D-ribosylamine
N1-(5-phospho-β-D-ribosyl)glycinamide
phosphoenolpyruvate
glutathione disulfide
3-methyl-2-oxobutanoate
(2S)-2-isopropyl-3-oxosuccinate
4-methyl-2-oxopentanoate
3-ethylmalate
2-oxovalerate
(2S)-2-isopropylmalate
(2R,3S)-3-isopropylmalate
2-isopropylmaleate
N-acetyl-β-D-glucosamine-1,6-anhydro-N-acetyl-β-D-muramate
1,6-anhydro-N-acetyl-β-muramate
(2R,4S)-2-methyl-2,3,3,4-tetrahydroxytetrahydrofuran
(2S,4S)-2-methyl-2,3,3,4-tetrahydroxytetrahydrofuran
bisorganyltrisulfane
enol-phenylpyruvate
(2R,4S)-2-methyl-2,4-dihydroxydihydrofuran-3-one
(2S,4S)-2-methyl-2,4-dihydroxydihydrofuran-3-one
pyruvic oxime
1-piperideine 6-carboxylate
aminoacetone
4-pyridoxolactone
CO2
N-acetyl-D-galactosamine 6-phosphate
D-galactosamine-6-phosphate
L-selenocystathionine
H2O
(4-hydroxyphenyl)acetate
(2E,6E)-farnesyl diphosphate
pristanate
4-methylphenol
L-homocysteine
cob(I)alamin
hemin
protoheme
hydrogen cyanide
protoporphyrinogen IX
protoporphyrin IX
uroporphyrinogen-III
hydrogen sulfide
oxygen
sn-glycerol 3-phosphate
3-phospho-D-glyceroyl-phosphate
2,3-diphospho-D-glycerate
3-phospho-D-glycerate
2-phospho-D-glycerate
Reactive Blue 5
(2R)-2,3-dihydroxy-3-methylbutanoate
α-D-glucosamine 6-phosphate
N-acetyl-D-mannosamine 6-phosphate
S-(4-hydroxy-nonenal-3-yl)-L-cysteinylglycine
1-oleoyl-2-lyso-glycerone phosphate
CMP-N-acetyl-β-neuraminate
2-iminobutanoate
2-iminopropanoate
L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanine
N-acetyl-L-glutaminyl-L-glutamine
N-acetyl-L-glutaminyl-L-glutamine amide
D-alanyl-D-alanine
L-alanyl-γ-D-glutamyl-meso-diaminopimelate
5,10-methenyltetrahydrofolate mono-L-glutamate
superoxide
N-acetyl-α-neuraminate
N-acetyl-β-neuraminate
dimethyl sulfide
S-(hydroxymethyl)glutathione
thiocyanate
glutathione
S-sulfanylglutathione
2-(2-carboxy-4-methylthiazol-5-yl)ethyl phosphate
2-[(2R,5Z)-2-carboxy-4-methylthiazol-5(2H)-ylidene]ethyl phosphate
5-(2-hydroxyethyl)-4-methylthiazole
4-methyl-5-(2-phosphooxyethyl)thiazole
L-cysteate
3-sulfopyruvate
(R)-S-lactoylglutathione
Fe3+
Fe2+
Mo2+
Zn2+
ammonium
H+
sulfite
selenide
molybdate
hydrogencarbonate
thiosulfate
hydrogensulfite
phosphonate
phosphate
diphosphate
trimethyl sulfonium
(2Z)-2-aminobut-2-enoate
2-aminoprop-2-enoate
spermidine
putrescine
choline
2-amino-5-formylamino-6-(5-phospho-D-ribosylamino)pyrimidin-4(3H)-one
glycerophosphoglycerol
glycerophosphoserine
sn-glycero-3-phosphocholine
sn-glycero-3-phosphoethanolamine
1-oleoyl-2-palmitoyl-phosphatidylglycerol
5'-deoxy-5'-fluoroadenosine
5-fluoro-5-deoxy-D-ribose 1-phosphate
5'-chloro-5'-deoxyadenosine
5-chloro-5-deoxyribose 1-phosphate
5-chloro-5-deoxy-D-ribonate
5-chloro-4-hydroxy-2-oxopentanoate
5-formamido-1-(5-phospho-D-ribosyl)-imidazole-4-carboxamide
1-(5-phospho-β-D-ribosyl)-5-[(5-phosphoribosylamino)methylideneamino]imidazole-4-carboxamide
phosphoribulosylformimino-AICAR-phosphate
5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide
5-amino-4-imidazolecarboxyamide
molybdopterin
coenzyme A
MoO2-molybdopterin cofactor
guanylyl molybdenum cofactor
7,8-dihydrofolate monoglutamate
tetrahydropteroyl tri-L-glutamate
5,6,7,8-tetrahydrofolate
(6S)-5-formyl-tetrahydrofolate mono-L-glutamate
5,10-methylenetetrahydropteroyl mono-L-glutamate
10-formyl-tetrahydrofolate mono-L-glutamate
5-methyltetrahydropteroyl mono-L-glutamate
5-methyltetrahydropteroyl tri-L-glutamate
thiamine
riboflavin
4-pyridoxate
pyridoxine
pyridoxamine
pyridoxamine 5'-phosphate
pyridoxal
(+)-7-epi-jasmonate
(S)-1-pyrroline-5-carboxylate
6,7-dimethyl-8-(1-D-ribityl)lumazine
FMN
FAD
7,8-dihydroneopterin 3'-phosphate
7,8-dihydroneopterin
7,8-dihydromonapterin
7,8-dihydroneopterin 3'-triphosphate
7,8-dihydroneopterin 2',3'-cyclic phosphate
molybdopterin adenine dinucleotide
cyclic pyranopterin phosphate
7,8-dihydropterin-6-ylmethyl-4-(β-D-ribofuranosyl)aminobenzene 5'-phosphate
6-(hydroxymethyl)-7,8-dihydropterin
(7,8-dihydropterin-6-yl)methyl diphosphate
7,8-dihydropteroate
dCMP
orotate
uracil
dTDP
dTTP
CDP
dCDP
dCTP
dUDP
dUTP
UDP
dUMP
dTMP
CTP
UTP
UDP-N-acetylmuramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanine
UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-L-lysine
UDP-N-acetyl-α-D-muramoyl-L-alanyl-D-glutamate
UDP-N-acetyl-α-D-muramoyl-L-alanine
UDP-3-O-[(3R)-3-hydroxymyristoyl]-N-acetyl-α-D-glucosamine
UDP-3-O-(3-hydroxymyristoyl)-α-D-glucosamine
UDP-2-N,3-O-bis[(3R)-3-hydroxytetradecanoyl]-α-D-glucosamine
UDP-α-D-glucose
UDP-α-D-galactose
UDP-N-acetyl-α-D-glucosamine-enolpyruvate
UDP-N-acetyl-α-D-muramate
UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-L-lysyl-D-alanine
UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine
UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-L-lysyl-D-alanyl-D-alanine
UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimelate
UDP-N-acetyl-α-D-glucosamine
4-(cytidine 5'-diphospho)-2-C-methyl-D-erythritol
2-phospho-4-(cytidine 5'-diphospho)-2-C-methyl-D-erythritol
uridine
cytidine
thymidine
2'-deoxycytidine
2'-deoxyuridine
thymine
UMP
CMP
preQ1
hypoxanthine
guanine
adenine
2'-deoxyadenosine
2'-deoxyguanosine
2'-deoxyinosine
inosine
guanosine
xanthosine
adenosine
dAMP
dGMP
dATP
dGTP
dITP
dADP
dGDP
dIDP
IDP
GDP
ADP
XMP
IMP
GMP
AMP
ITP
GTP
ATP
preQ0
urate
indole
(1S,2R)-1-C-(indol-3-yl)glycerol 3-phosphate
demethylmenaquinol-8
protocatechuate
4-aminobenzoate
chorismate
(4S)-4-hydroxy-2-oxoglutarate
succinate
fumarate
L-aspartate
(S)-malate
cis-aconitate
D-threo-isocitrate
(R)-lactate
formate
acetate
pyruvate
decanoate
octanoate
(15Z)-tetracosenoate
oleate
(3E,5Z)-tetradecadienoate
di-homo-γ-linolenate
linoleate
α-linolenate
(5Z,8Z,11Z,14Z,17Z)-icosapentaenoate
phytenate
stearate
palmitate
D-mannonate
D-gluconate
D-tagaturonate
aldehydo-D-galacturonate
3-(4-hydroxyphenyl)pyruvate
3-phenyl-2-oxopropanoate
4-(methylsulfanyl)-2-oxobutanoate
glyoxylate
2-oxobutanoate
2-oxoglutarate
L-α-amino-ε-keto-pimelate
L-serine
L-proline
L-alanine
L-glutamine
L-leucine
glycine
D-glutamate
L-glutamate
L-arginine
L-lysine
L-histidine
L-tyrosine
L-asparagine
L-threonine
L-cysteine
L-tryptophan
L-phenylalanine
D-alanine
L-2-amino-3-oxobutanoate
L-aspartyl-4-phosphate
seleno-L-homocysteine
3-phospho-L-serine
N-carbamoyl-L-aspartate
O-acetyl-L-homoserine
L-citrulline
L-valine
L-isoleucine
L-ornithine
L-canaline
L-aspartate 4-semialdehyde
L-glutamate-5-semialdehyde
O-succinyl-L-homoserine
S-adenosyl-L-methionine
S-adenosyl-L-homocysteine
S-sulfo-L-cysteine
L-homoserine
O-phospho-L-homoserine
S-(4-hydroxy-nonenal-3-yl)-L-cysteine
meso-diaminopimelate
L-selenocysteine
L-methionine
L,L-diaminopimelate
L-cystathionine
a methyl group
methylglyoxal
diacetyl
glycolaldehyde
formaldehyde
acetaldehyde
D-glyceraldehyde
α-D-glucopyranose
β-D-glucopyranose
α-D-galactopyranose
β-D-galactopyranose
aldehydo-D-ribose
α-D-ribofuranose
β-D-ribofuranose
ethanol
methanol
glycerol
(3R)-linalool
(3S)-linalool
myo-inositol
1D-myo-inositol 3-monophosphate
(3E,5Z)-tetradeca-3,5-dienoyl-CoA
1-C16:0-α,ω-dicarboxyl-2-lysophosphatidate
1-oleoyl-sn-glycerol 3-phosphate
1-(oleoyl)-sn-glycero-3-phosphoethanolamine
dioleoyl phosphatidate
phosphatidylglycerophosphate (1-octadecenoyl(9Z), 2-palmitoyl)
trans,octacis-decaprenyl phosphate
di-trans,octa-cis-undecaprenyl phosphate
geranyl diphosphate
all-trans-octaprenyl diphosphate
mono-trans,octa-cis-decaprenyl diphosphate
di-trans,octa-cis-undecaprenyl diphosphate
galactosyl-glucosyl-(heptosyl)3-Kdo2-lipid A-bisphosphate
4-O-phospho-α-Kdo-(2→6)-lipid IVA
galactosyl-(glucosyl)3-(heptosyl)3-Kdo2-lipid A-bisphosphate
galactosyl-(glucosyl)2-(heptosyl)3-Kdo2-lipid A-bisphosphate
glucosyl-(heptosyl)3-Kdo2-lipid A-bisphosphate
glucosyl-(heptosyl)3-Kdo2-lipid A-phosphate
glucosyl-(heptosyl)2-Kdo2-lipid A-phosphate
glucosyl-(heptosyl)2-Kdo2-lipid A
α-Kdo-(2→6)-lipid IVA
α-D-Kdo-(2→4)-α-D-Kdo-(2→6)-lipid A
heptosyl-Kdo2-lipid A
(heptosyl)2-Kdo2-lipid A
α-Kdo-(2->4)-α-Kdo-(2->6)-lipid IVA
maltotriose
maltotetraose
maltopentaose
maltoheptaose
maltohexaose
sucrose
N-acetyl-α-D-glucosamine 1-phosphate
N-acetyl-β-D-mannosamine
N-acetyl-β-D-glucosamine
β-D-fructofuranose
decaprenyl-diphospho-N-acetylmuramoyl-pentapeptide
decaprenyl-pyrophosphoryl-(N-acetylglucosamine)-N-acetylmuramyl-(pentapeptide)
a peptidoglycan dimer (mycobacteria)
a peptidoglycan dimer (S. aureus)
a peptidoglycan dimer (E. faeciums)
undecaprenyl-diphospho-N-acetylmuramoyl-L-alanyl-γ-D-glutamyl-L-lysyl- D-alanine
a peptidoglycan with D,D cross-link (S. aureus)
a peptidoglycan tetramer with a D,D cross-link (Enterococcus faecium)
a peptidoglycan with D,D cross-links (mycobacteria)
a peptidoglycan with L,D cross-links (mycobacteria)
a peptidoglycan dimer (meso-diaminopimelate containing)
a peptidoglycan with D,D cross-links (meso-diaminopimelate containing)
ditrans,octacis-undecaprenyldiphospho-[(N-acetyl-β-D-glucosaminyl)-(1,4)-]-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine
GlcNAc-1,6-anhMurNAc-L-Ala-γ-D-Glu-DAP-D-Ala
undecaprenyldiphospho-N-acetylmuramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine
undecaprenyl-diphospho-N-acetylmuramoyl-L-alanyl-γ-D-glutamyl-L-lysyl- D-alanyl-D-alanine
sucrose 6F-phosphate
CMP-3-deoxy-β-D-manno-octulosonate
ADP-α-D-glucose
GDP-α-D-mannose
D-glyceraldehyde 3-phosphate
α-D-glucopyranose 1-phosphate
1-(o-carboxyphenylamino)-1'-deoxyribulose 5'-phosphate
5-phospho-α-D-ribose 1-diphosphate
D-sedoheptulose 7-phosphate
D-erythrose 4-phosphate
β-D-fructose 1,6-bisphosphate
D-fructose 6-phosphate
β-D-fructofuranose 6-phosphate
α-D-mannopyranose 6-phosphate
β-D-mannopyranose 6-phosphate
β-D-glucose 6-phosphate
α-D-glucose 6-phosphate
1-deoxy-D-xylulose 5-phosphate
D-xylulose 5-phosphate
aldehydo-D-arabinose 5-phosphate
D-ribulose 5-phosphate
aldehydo-D-ribose 5-phosphate
α-D-ribose 5-phosphate
β-D-ribose 5-phosphate
α-D-ribose-1-phosphate
2-deoxy-α-D-ribose 1-phosphate
α-D-galactose 1-phosphate
β-D-glucopyranose 1-phosphate
β-D-fructofuranose 1-phosphate
α-D-mannose 1-phosphate
D-altronate
1-(5-phospho-β-D-ribosyl)-ATP
1-(5-phospho-β-D-ribosyl)-AMP
cyclic-AMP
pppGpp
ppGpp
cyclic-GMP
adenylo-succinate
5'-deoxyadenosine
NADH
NADPH
NAD+
NADP+
2-sulfanyl-N6-dimethylallyladenosine37 in tRNA
2-methylsulfanyl-N6-dimethylallyladenosine37 in tRNA
reduced β-nicotinamide D-ribonucleotide
β-nicotinamide D-ribonucleotide
succinyl-CoA
dihomo γ-linolenoyl-CoA
(+)-7-epi-jasmonoyl-CoA
α-linolenoyl-CoA
linoleoyl-CoA
3'-dephospho-CoA
acetyl-CoA
malonyl-CoA
(11Z,14Z,17Z)-3-oxoicosatrienoyl-CoA
(3R,11Z,14Z,17Z)-3-hydroxyicosatrienoyl-CoA
phytenoyl-CoA
oleoyl-CoA
(Z)-15-tetracosenoyl-CoA
decanoyl-CoA
octanoyl-CoA
stearoyl-CoA
palmitoyl-CoA
pristanoyl-CoA
hexadecanedioyl-CoA
D-glucono-1,5-lactone
(S)-NADHX
(R)-NADHX