| R,S | receptor agonist |
|---|---|
| R,S | R)- , (S)- , and |
| R,S | receptor antagonist |
| R- | radical |
| R----L | right to left |
| R-CMAS | Revised Children's Manifest Anxiety Scale |
| R-DNA | recombinant DNA |
| R-EAE | Relapsing experimental autoimmune encephalomyelitis |
| R-EPO | Recombinant erythropoietin |
| r-FSH | recombinant follicle stimulating hormone |