Task: Text Categorization
Input (English): A derivative of this compound prefixed by pseudo- is an important modifier of the T-arm of tRNA, while its fluorine derivative is used to inhibit the enzyme thy-mi-dyl-ate syn-thase, effects of which are essential to its use in chemotherapy. Its N-gly-coy-lase is an important excision enzyme, participation of which explains the absence of Okazaki fragments on the leading strand; it is also essential to protection from damage resulting from deamination of another compound to this nucleotide. First identified in herring sperm, FTP, name this pyrimidine in which the lack of a methyl group is the only difference between it and the nucleotide it replaces, thymine, in RNA.
Output (English): Science