| HTR | histidine transport regulator; 5-hydroxytryptamine receptor |
|---|---|
| RCC | radiological control center; rape crisis center; ratio of cost to charges; receptor-chemoeffector co... |
| ReV | regulator of virion |
| Rex | regulator x |
| RMSA | regulator of mitotic spindle assembly; rhabdomyosarcoma, alveolar |