| UAW | upper airway |
|---|---|
| UB | Ubiquitin |
| UB | ureteric bud |
| UBBC | Unsaturated vitamin B12 binding capacity |
| UBC | unipolar brush cell |
| UBCs | Ubiquitin conjugating enzymes |
| UBF | Upstream Binding Factor |
| UBF | Uterine blood flow |
| UBG | ultimobranchial gland |
| UBM | Ultrasound Biomicroscopy |