China 
Africa 
- 3beta-hydroxysteroid dehydrogenase
- 3c protease
- 3c-like protease
- 3β-Hydroxysteroid dehydrogenase
- 4 aminobenzoic acid
- 4 aminopyridine
- 4 hydroxybutyric acid
- 4-Aminobiphenyl
- 4-Aminoquinoline
- 4-Aminosalicylic acid
- 4-Chlorophenoxyacetic acid
- 4-D
- 4-Hydroxybenzoic acid
- 4-Hydroxycoumarins
- 4-Hydroxycyclophosphamide
- 4-Hydroxyestradiol
- 4-Hydroxyestrone
- 4-Hydroxynonenal
- 4-Hydroxyphenylpyruvate dioxygenase
- 4-Hydroxyphenylpyruvic acid
- 4-Methoxybutyrfentanyl
- 4-Methoxyestradiol
- 4-Methylcatechol
- 4-Methylimidazole
- 4-Nitroaniline
- 4-Nitroquinoline 1-oxide
- 4-Phenylpiperidine
- 4-Quinolone
- 4-Vinylpyridine
- 4-aminopyridine
- 4-aminosalicylic acid
- 4-tert-Butylcatechol
- 43S preinitiation complex
- 47 XYY syndrome
- 4D reconstruction
- 4DCT
- 5 10 methylenetetrahydrofolate
- 5 HETE
- 5 alpha reductase
- 5 choice serial reaction time task
- 5 fluorouracil
- 5 hydroxyindoleacetic acid
- 5 hydroxymethylfurfural
- 5 hydroxytryptophan
- 5 meo dmt
- 5 methoxypsoralen
- 5 methoxytryptamine
- 5 methylcytosine
- 5 methyltetrahydrofolate
- 5 nucleotidase
- 5 oxoproline
- 5 untranslated region
- 5' UTR
- 5'-nucleotidase
- 5-Carboxamidotryptamine
- 5-Fluoroorotic acid
- 5-Formylcytosine
- 5-HT receptor
- 5-HT1 receptor
- 5-HT1A receptor
- 5-HT1D receptor
- 5-HT1F receptor
- 5-HT2A receptor
- 5-HT2B receptor
- 5-HT2C receptor
- 5-HT3 antagonists
- 5-HT3 receptor
- 5-HT4 receptor
- 5-HT6 receptor
- 5-HT7 receptor
- 5-HTP
- 5-Hydroxymethylcytosine
- 5-MAPB
- 5-Methylcytidine
- 5-Oxo-eicosatetraenoic acid
- 5-Sulfosalicylic acid
- 5-fluorouracil
- 5-ht2a
- 5-ht3 antagonists
- 5-ht6
- 5-lipoxygenase
- 5-lipoxygenase-activating protein
- 5-oxoprolinase
- 50s ribosomal subunit
- 5S rRNA
- 5S ribosomal RNA
- 5q- syndrome
- 5α-Dihydroprogesterone
- 5α-Reductase inhibitors
- 5α-reductase
- 5α-reductase inhibitors
- 5β-Dihydrotestosterone
- 5β-Pregnane
- 5′ flanking region
- 6 monoacetylmorphine
- 6 phosphofructo 2 kinase
- 6-APA
- 6-APB
- 6-Benzylaminopurine
- 6-Hydroxymelatonin
- 6-Phosphogluconate dehydrogenase
- 6-pyruvoyltetrahydropterin synthase
- 6β-Hydroxycortisol
- 7 8 dihydroxyflavone
- 7 dehydrocholesterol
- 7 methylguanosine
- 7-ACA
- 7-Aminoactinomycin D
- 7-Chlorokynurenic acid
- 7-Dehydrocholesterol reductase
- 7-Hydroxymitragynine
- 7-Methylguanine
- 7-Nitroindazole
- 7-nitroindazole
- 7α-Hydroxy-4-cholesten-3-one
- 7α-Hydroxycholesterol
- 8-Aminoquinoline
- 8-Hydroxyguanosine
- 8-OH-DPAT
- 8-Oxo-2'-deoxyguanosine
- 8-Oxoguanine
- 8-Prenylnaringenin
- 9-Aminoacridine
- 9-Carboxymethoxymethylguanine
- A grain of salt
- A-230
- A-not-B error
- A-scan
- A-site
- A1 pulley
- A23187
- A431 cells
- A549 cells
- AA amyloidosis
- AAA
- AAA proteins
- AANAT
- AARS2
- AB toxins
- AB-FUBINACA
- ABC transporters
- ABCA1
- ABCA12
- ABCA3
- ABCA4
- ABCA7
- ABCB5
- ABCB6
- ABCB7
- ABCC1