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Comparison of the preferred actions of human Y-family DNA polymerases opposite a cis–syn TT-dimer. The relative frequency of nucleotide incorporations opposite the (a) 3′-dT or (b) 5′-dT of the cis–syn TT-dimer is indicated. For comparison, relative frequency of nucleotide incorporations opposite the corresponding (c) 3′-dT or (d) 5′-dT of the control template is indicated.
