Pyrimidine nucleobase specific to DNA. The 5-methyl group distinguishes it from uracil and provides a signal that uracil arising from cytosine deamination is damage (Why DNA uses thymine: Poole et al. 2001 argument).
Pyrimidine nucleobase specific to DNA. The 5-methyl group distinguishes it from uracil and provides a signal that uracil arising from cytosine deamination is damage (Why DNA uses thymine: Poole et al. 2001 argument).