There are multiple definitions:

1. ubiquitin-proteasome system(English)

   • main sensor for the health of neurons
   • AD, ALS, AMPK, CARP, DARP, GABARAP, GIM, LIR, LLPS, MLP, mTOR, MURF, PEVK-domain, PROTAC, UBA, UBD
   • Neurons, Biomarker
   • https://lifesen…oteasomesystem/
   • https://doi.org…science.aax3769

2. uninterruptable power supply(English)

   • UBEC
   • Medical technology (assessment)

3. undifferentiated pleomorphic sarcoma(English)

   • an aggressive, high-grade cancer of the soft tissues, formerly known as Malignant Fibrous Histiocytoma (MFH), characterized by fast-growing tumors with oddly shaped, primitive cells that do not match normal tissue
   • AS, BP, COG, CTRCD, DFS, ECG, GIST, ICI, LMS, LVEF, MFH, PAS, PCS, RMS, STS, TKI
   • Oncology, Cardiology
   • https://doi.org…cao.2025.09.005

4. urgency perception scale(English)

   • OAB, OAB-q, PPBC, UUI
   • Urology, Scoring systems/scales
   • https://doi.org….1111/bju.12678