| uridine 5'-triphosphate | <biochemistry> Uridine esterified with triphosphoric acid at its 5'-position; the immediate precursor of uridylic acid residues in RNA. (05 Mar 2000) |
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| uridine triphosphate | A molecule which consists of the nitrogenous base uracil linked to the sugar ribose and which has a chain of three phosphate groups attached to the ribose in a linear fashion. UTP is required during transcription since it is a direct precursor of RNA. (09 Oct 1997) |