title: Photoalkylation of purines in DNA.
mesh_terms: D000225:Adenine / Q000528:radiation effects; D000478:Alkylation; D002845:Chromatography; D004247:DNA / Q000528:radiation effects*; D006147:Guanine / Q000528:radiation effects; D010777:Photochemistry; D011687:Purines / Q000528:radiation effects*; D011830:Radiation Effects; D014466:Ultraviolet Rays
chemical_list: D011687:Purines; D006147:Guanine; D004247:DNA; D000225:Adenine