| MRR | marrow release rate; maximum relation rate |
|---|---|
| PFR | parotid flow rate; peak flow rate |
| PRR | proton relaxation rate; pulse repetition rate |
| RRR | regular rhythm and rate; renin release rate (or ratio) |
| SER | sebum excretion rate; sensitizer enhancement ratio; sensory evoked response; service; smooth endopla... |