| RI | radiation intensity; radioactive isotope; radioimmunology; recession index; recombinant inbred [stra... |
|---|---|
| ROI | reactive oxygen intermediate; region of interest; right occipitolateral [fetal position] |
| PCR | Polymerase Chain Reaction |
| Rxn | Reaction |
| ADR | activation, depression, repetition [in bone remodeling]; adrenodoxin reductase; Adriamycin; adverse ... |