- Ubiquinol Cytochrome C Reductase Complex (UCRC)
- Ubiquitin Carboxyl Terminal Hydrolase L5 (UCHL5)
- Ubiquitin Carboxyl Terminal Hydrolase L3 (UCHL3)
- Ubiquitin Carboxyl Terminal Hydrolase L1 (UCHL1)
- Ubiquilin 4 (UBQLN4)
- Ubiquilin 3 (UBQLN3)
- Ubiquilin 2 (UBQLN2)
- Ubiquilin 1 (UBQLN1)
- Ubiquitin Like Protein 7 (UBL7)
- Ubiquitin Like Protein 3 (UBL3)
- Ubiquitin Like Protein 4A (UBL4A)
- Ubiquitin Like Protein 5 (UBL5)
- Ubiquitin Like Protein 4B (UBL4B)
- Ubiquitination Factor E4A (UBE4A)
- Ubiquitin Protein Ligase E3B (UBE3B)
