. "US" . "Biochemistry" . "BICHAW" . "0033" . "0006-2960" . "33" . "4755" . "4761" . "10.1021/bi00182a002" . . "Guanine-1,N6-ethenoadenine base pairs in the crystal structure of d(CGCGAATT(epsilon dA)GCG)." . . . . . . .