| ARO-ir | Aromatase-immunoreactive |
|---|---|
| AROM | active range of motion |
| ARP | actin-related protein |
| ARP | absolute refractory period |
| ARPKD | Autosomal recessive polycystic kidney disease |
| ARR | Absolute risk reduction |
| aRR | Adjusted relative risk |
| ARRP | Autosomal recessive retinitis pigmentosa |
| ars | Arsenical resistance |
| ARS | Autonomously replicating sequence |