title: Photochemistry of polynucleotides I-ultraviolet photolysis of substituted pyrimidines.
mesh_terms: D003596:Cytosine; D003597:Cytosine Nucleotides; D006863:Hydrogen-Ion Concentration; D009686:Nuclear Physics; D011119:Polynucleotides; D013053:Spectrophotometry; D014466:Ultraviolet Rays; D014500:Uracil Nucleotides; D014529:Uridine
chemical_list: D003597:Cytosine Nucleotides; D011119:Polynucleotides; D014500:Uracil Nucleotides; D003596:Cytosine; D014529:Uridine