| RNA Replicase Inhibitors | Not Available | 2 | 19 | Details |
| RNA Replicase, antagonists & inhibitors | Not Available | 2 | 3 | Details |
| RNA Synthetase Inhibitor Antibacterial | Not Available | 1 | 1 | Details |
| RNA Synthetase Inhibitors | Not Available | 1 | 1 | Details |
| RNA, Antisense | RNA molecules which hybridize to complementary sequences in either RNA or DNA altering ... more | 13 | 23 | Details |
| RNA, Double-Stranded | Not Available | 1 | 1 | Details |
| RNA, Messenger | RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are genera... more | 1 | 1 | Details |
| RNA, Ribosomal, 23S | Not Available | 2 | 8 | Details |
| RNA, Small Untranslated | Short RNA, about 200 base pairs in length or shorter, that does not code for protein. | 12 | 20 | Details |
| RNA, Untranslated | RNA which does not code for protein but has some enzymatic, structural or regulatory fu... more | 12 | 20 | Details |
| RNA-Binding Proteins | Proteins that bind to RNA molecules. Included here are RIBONUCLEOPROTEINS and other pro... more | 1 | 1 | Details |
| RNA-Dependent RNA Polymerase, antagonists & inhibitors | Not Available | 2 | 3 | Details |
| RNA-Directed DNA Polymerase | An enzyme that synthesizes DNA on an RNA template. It is encoded by the pol gene of ret... more | 3 | 3 | Details |
| Rodenticides | Substances used to destroy or inhibit the action of rats, mice, or other rodents. | 1 | 10 | Details |
| Roentgenography | Not Available | 12 | 32 | Details |
| Root Canal Filling Materials | Not Available | 2 | 14 | Details |
| ROS1 tyrosine kinase inhibitors | Not Available | 7 | 77 | Details |
| Rosaceae | The rose plant family in the order ROSALES and class Magnoliopsida. They are generally ... more | 3 | 0 | Details |
| Rosales | A plant family of the order ROSALES. | 3 | 0 | Details |
| Rosanae | A suborder of flowering plants of the class MAGNOLIOPSIDA which comprises two major gro... more | 6 | 6 | Details |
| Rota Virus Diarrhea Vaccines | Not Available | 1 | 0 | Details |
| Rotavirus Vaccines | Not Available | 0 | 0 | Details |
| Rubella Vaccines | Not Available | 1 | 0 | Details |
| Rubiaceae | Not Available | 1 | 1 | Details |
| Ruthenium | Not Available | 1 | 2 | Details |