The role of relay station is adopted by the guanine bases over which the positive charge is distributed during long-distance charge transport through DNA. Mismatches at guanine:cytosine (G:C) base pairs reduce the efficiency of charge transport through DNA drastically. The picture shows the histogram of the cleavage products PG and PGGG of a 54-mer, from which only the decisive sequence segment is depicted.
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Giese et al. (2000) studied this question.
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