Also known as U 4
U4, U-4, or U04 may refer to:
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- Other uses
- See also
U4, U-4, or U04 may refer to:
==Science and technology== U4 spliceosomal RNA, a non-coding RNA component of the major U2-dependent spliceosome Haplogroup U4 (mtDNA), a human genetic group U4, unitary group of degree 4 U-47700, a synthetic opioid U04, the ICD-10 code for severe acute respiratory syndrome