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. Author manuscript; available in PMC: 2012 Sep 6.
Published in final edited form as: Biochemistry. 2011 Aug 11;50(35):7666–7673. doi: 10.1021/bi2007417

Figure 1.

Figure 1

Structures of the four carboxymethylated nucleosides, N6-CMdA, N4-CMdC, N3-CMdT, and O4-CMdT, as well as the 20mer sequences of the lesion-containing substrates used for the in vitro replication studies.