Uracil - Wikipedia
So cells continue to use uracil in RNA, and not in DNA, because RNA is shorter-lived than DNA, and any potential uracil-related errors do not lead to lasting damage.

Uracil | C4H4N2O2 | CID 1174 - PubChem
Uracil is a common and naturally occurring pyrimidine nucleobase in which the pyrimidine ring is substituted with two oxo groups at positions 2 and 4. Found in RNA, it base pairs with adenine and replaces thymine during DNA transcription.

Uracil | Nucleobase, Nucleoside & DNA | Britannica
uracil, a colourless, crystalline organic compound of the pyrimidine family that occurs as a component of ribonucleic acid (RNA), a molecule involved in the transmission of hereditary characteristics.

Uracil - National Human Genome Research Institute
Uracil (U) is one of the four nucleotide bases in RNA, with the other three being adenine (A), cytosine (C) and guanine (G). In RNA, uracil pairs with adenine. In a DNA molecule, the nucleotide thymine (T) is used in place of uracil.

What Is Uracil and What Does It Do in RNA? - Biology Insights
Uracil is a fundamental organic molecule and one of the four primary building blocks, or nucleobases, of Ribonucleic Acid (RNA). It is a nitrogen-containing compound that plays a crucial part in translating genetic information into functional components of the cell.

Uracil - New World Encyclopedia
Uracil is used in animals and plants to help carry out the synthesis of many enzymes necessary for cell function through bonding with riboses and phosphates (Garrett and Grisham). Uracil serves as an allosteric regulator and coenzyme for reactions in the human body and in plants (Brown 1998).

Uracil - an overview | ScienceDirect Topics
The use of uracil compounds in treating viral infections, cancer, diabetic, thyroid and autosomal recessive disorders are discussed in the review. The mechanism of action of each uracil drug with emphasis on their structure and properties are discussed in detail.