| UCR | unconditioned response |
|---|---|
| UCRP | Ubiquitin cross-reactive protein |
| UCS | Unconditioned Stimulus |
| UCSD | University of California San Diego |
| UCSF | University of California San Francisco |
| UCSF | University of California at San Francisco |
| UCTD | Undifferentiated Connective Tissue Disease |
| UCVA | Uncorrected visual acuity |
| UD | Unrelated donor |
| UDA | Urtica dioica agglutinin |