| RNR | ribonucleotide reductase |
|---|---|
| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |
| RRM | ribonucleotide reductase M |
| AICAR | aminoimidazole carboxamide ribonucleotide |
| AIR | amino-imidazole ribonucleotide; average impairment rating |