. "US" . "Proc.Natl.Acad.Sci.USA" . "PNASA6" . "0040" . "0027-8424" . "83" . "2402" . "2406" . "10.1073/pnas.83.8.2402" . . "Molecular structure of the G.A base pair in DNA and its implications for the mechanism of transversion mutations." . . . . .