| Acetylcholine, metabolism | Not Available | 1 | 8 | Details |
| Acetylcholine, secretion | Not Available | 0 | 0 | Details |
| Acetylglucosamine | Not Available | 0 | 0 | Details |
| Acid Anhydride Hydrolases | A group of enzymes that catalyze the hydrolysis of diphosphate bonds in compounds such ... more | 1 | 0 | Details |
| Acid Etching, Dental | Not Available | 2 | 5 | Details |
| Acid Preparations | Not Available | 4 | 120 | Details |
| Acid Reducers | Drugs which actively reduce the hydronium concentration of the gastric system. Includes... more | 18 | 194 | Details |
| Acid Sensing Ion Channel Blockers | A subclass of sodium channel blockers that are specific for ACID-SENSING SODIUM CHANNELS. | 1 | 13 | Details |
| Acidic Glycosphingolipids | A subclass of GLYCOSPHINGOLIPIDS containing large polar heads made up of several sugar ... more | 1 | 0 | Details |
| Acidifiers | Not Available | 2 | 1 | Details |
| Acidifying Activity | Not Available | 2 | 52 | Details |
| Acidifying Agents | Not Available | 1 | 0 | Details |
| Acids | Chemical compounds which yield hydrogen ions or protons when dissolved in water, whose ... more | 202 | 589 | Details |
| Acids, Acyclic | Carboxylic acids that have open-chain molecular structures as opposed to ring-shaped st... more | 408 | 1142 | Details |
| Acids, Aldehydic | Dicarboxylic acids in which one of the carboxyl groups (-COOH) has been replaced by an ... more | 6 | 16 | Details |
| Acids, Carbocyclic | Carboxylic acids that have a homocyclic ring structure in which all the ring atoms are ... more | 359 | 826 | Details |
| Acids, Noncarboxylic | Inorganic acids with a non metal, other than carbon, attached to hydrogen, or an acid r... more | 202 | 589 | Details |
| Acitretin | Not Available | 1 | 9 | Details |
| Acquired Immunodeficiency Syndrome | Not Available | 1 | 1 | Details |
| Acridine Derivatives | Not Available | 2 | 0 | Details |
| Acridines | Compounds that include the structure of acridine. | 7 | 25 | Details |
| Acromegaly | Not Available | 2 | 10 | Details |
| Acrylates | Derivatives of acrylic acid (the structural formula CH2=CHCO2H), including its salts an... more | 16 | 18 | Details |
| Actinium | Not Available | 1 | 0 | Details |
| Actinoid Series Elements | A series of radioactive elements from ACTINIUM, atomic number 89, to and including LAWR... more | 2 | 0 | Details |