text: ABC-Transporter Genes - abl gene - acetic acid - acetyl CoA - acetylcholine - acetylcysteine - acid - acidic fibroblast growth factor - acrosin - actin - action potential - activation energy - active site - active transport - adenosine - adenosine diphosphate (ADP) - adenosine monophosphate (AMP) - adenosine triphosphate (ATP) - adenovirus - adrenergic receptor - adrenodoxin - aequorin - aerobic respiration - agonist - alanine - albumin - alcohol - alcoholic fermentation - alicyclic compound - aliphatic compound - alkali - allosteric site - allostery - allotrope - allotropy - alpha adrenergic receptor - alpha helix - alpha-1 adrenergic receptor - alpha-2 adrenergic receptor - alpha-beta T-cell antigen receptor - alpha-fetoprotein - alpha-globulin - alpha-macroglobulin - alpha-MSH - Ames test - amide - amine - amino - amino acid - amino acid receptor - amino acid sequence - amino acid sequence homology - aminobutyric acid - ammonia - AMPA receptor - amyloid - anabolism - anaerobic respiration - analytical chemistry - androgen receptor - angiotensin - angiotensin II - angiotensin receptor - ankyrin - annexin II - antibiotic - antibody - apoenzyme - apolipoprotein - apoptosis - aquaporin - archaea - arginine - argipressin - aromatic amine - aromatic compound - arrestin - Arrhenius equation - aryl hydrocarbon receptor - asparagine - aspartic acid - atom - atomic absorption spectroscopy - atomic mass - atomic mass unit - atomic nucleus - atomic number - atomic orbital - atomic radius - Atomic weight - ATP synthase - ATPase - atrial natriuretic factor - atrial natriuretic factor receptor - Avogadro constant - axon