| Label | Id | |
|---|---|---|
| alkene | http://id.nlm.nih.gov/mesh/2021/D000475 | |
| alkylating antineoplastic agent | http://id.nlm.nih.gov/mesh/2021/D018906 | |
| alkylation | http://id.nlm.nih.gov/mesh/2021/D000478 | |
| alkyne | http://id.nlm.nih.gov/mesh/2021/D000480 | |
| allantoin | http://id.nlm.nih.gov/mesh/2021/D000481 | |
| allantois | http://id.nlm.nih.gov/mesh/2021/D000482 | |
| allele | http://id.nlm.nih.gov/mesh/2021/D000483 | |
| allelopathy | http://id.nlm.nih.gov/mesh/2021/D064089 | |
| allergen | http://id.nlm.nih.gov/mesh/2021/D000485 | |
| allergen immunotherapy | http://id.nlm.nih.gov/mesh/2021/D003888 | |
| allergic bronchopulmonary aspergillosis | http://id.nlm.nih.gov/mesh/2021/D001229 | |
| allergic conjunctivitis | http://id.nlm.nih.gov/mesh/2021/D003233 | |
| allergic contact dermatitis | http://id.nlm.nih.gov/mesh/2021/D017449 | |
| allergic rhinitis | http://id.nlm.nih.gov/mesh/2021/D065631 | |
| allergist | http://id.nlm.nih.gov/mesh/2021/D000072223 |