| RER | renal excretion rate; respiratory exchange ratio; rough endoplasmic reticulum |
|---|---|
| RSA | rabbit serum albumin; regular spiking activity; relative specific activity; relative standard accura... |
| sER | smooth endoplasmic reticulum |
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |
| TER | teratogen; total endoplasmic reticulum; transcapillary escape rate |