Acetone sensitized photochemical reaction between cytosine and cysteine in water yields 5,6-dihydro-uracil (72%), 5-S-cysteinyl-5,6-dihydrouracil (24%), and uracil (2.2%), suggesting that radiation may cause not only crosslinking of proteins to nucleic acids but also base modifications.
N. C. Yang, R. Okazaki and F. Liu, J. Chem. Soc., Chem. Commun., 1974, 462 DOI: 10.1039/C39740000462
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