Bit different: 2,4-Dioxo- and 2,4-diamino-5-aminopyrimidine nuclei attached to an oligodipeptide backbone display a disparity in their base-pairing strength which is opposite to that shown by corresponding triazines. This behavior points to a remarkable correlation between pairing strength and ΔpKa values of pairs of complementary bases.
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Mittapalli et al. (2006) studied this question.
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