Abstract
Pyrimidine bases can give different products on UV irradiation in the presence and the absence of air; hence the action of UV radiation in vivo cannot be deduced solely from in vitro experiments conducted with exclusion of air. A remarkable observation made on UV irradiation of cytosine, uracil, thymine, and similar bases in aqueous solution in the presence of air is the elimination of CO. Perhaps CO is formed in nature by such reactions.
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