U1 One of a group of small nuclear ribo-nucleoproteins (snRNP) that function in RNA splicing. Others include U2, U4, U5 and U6.

Madhani HD and Guthrie C (1994) Annu Rev Genet 28, 1

U virus Synonym for echovirus 11. Found in children with acute upper respiratory illness. May cause rashes, uveitis and gastrointestinal disturbances.

63U11 virus A species in the genus Bunyavirus serologically related to C group viruses. No known association with disease.

Uasin Gishu virus (UGDV) A tentative species in the genus Orthopoxvirus. Isolated from horses in Central Africa.

Uatuma virus A possible species in the genus Orbivirus, isolated from phle-botomine sandflies in the Amazon region of Brazil. Antigenically related to Changuinola virus. Not reported to cause human disease.

ubiquitin A protein containing 76 amino acids that is highly conserved in all eukaryotic organisms. Addition of multiple ubiquitin molecules to a cellular protein (ubiquitination) targets it for rapid degradation by the 26S proteasome.

Muller S and Schwartz LM (1995) Bioassays 17, 677

Uganda S virus (UGSV) A species in the genus Flavivirus, a member of the Yellow fever virus serogroup. Isolated in Uganda, Nigeria and Central African Republic from mosquitoes of Aedes sp and birds. Antibodies found in humans and Cercopithecus sp but there is no evidence that the virus causes disease. Synonym: Makonde virus.

ulcerative dermatosis virus Probably a strain of Orf virus.

Trueblood MS (1966) Cornell Vet 56, 521

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