| RU | Resistance Units |
|---|---|
| RUB | Rubella virus |
| RuBisCO | D-ribulose-1,5-bisphosphate carboxylase/oxygenase |
| RuBisCO | Ribulose bisphosphate carboxylase |
| Rubisco | Ribulose-bisphosphate carboxylase/oxygenase |
| RUG | Resource Utilization Group |
| RUL | Right upper lobes |
| RUL | right unilateral |
| RUMT | tRNA (m5 U54)-methyltransferase |
| RUP | rumen undegradable protein |