| RK | rabbit kidney; radial keratotomy; reductase kinase; rhodopsin kinase; right kidney |
|---|---|
| RNR | ribonucleotide reductase |
| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |
| RRM | ribonucleotide reductase M |
| SPR | sepiapterin reductase; serial probe recognition; specific pathogen free; Society for Pediatric Radio... |