U4
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U4 can refer to:
- U4 spliceosomal RNA, a non-coding RNA component of the major U2-dependent spliceosome
- Anti-Corruption Resource Centre (U4), based at the Chr. Michelsen Institutein in Bergen, Norway
- U4 (Berlin U-Bahn), a subway line in Berlin, Germany
- U4 (Frankfurt U-Bahn), a subway line in Frankfurt, Germany
- London Buses route U4

