Figure 4.

Simplified charge distributions in the DNA oligomer d[5′-(G)₅-3′]·d[3′-(C)₅-5′] in the neutral state in the gas phase and in water, as indicated. Same as in Figure 3 except that the net charges of the fragments are shown. The fragment from which the largest fraction of an electron is removed is shown by the bold fonts and bold lines. The net charge of the fragment after removing an electron is indicated by an arrow. The fragments of sugars and bases are divided at the N9−C1′ bond for guanines and the N1−C1′ bond for cytosines. The fragments of the phosphates and sugars are divided at the P−O5′ and P−O3′ bonds. Thus, S₂ and P₂ denote C₅H₈O₃ and PO₂H, respectively.