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The suggestion that phosphorus/arsenic replacement in DNA can play a role in living things has generated great controversy (Wolfe‐Simon et al., Science 2011, 332, 1163). Examined here theoretically are substitution effects on Watson–Crick base pairing and base stacking patterns in realistic DNA subunits. Using duplex DNA models deoxyguanylyl‐3′,5′‐deoxycytidine ([dGpdC]2) and deoxycytidyly‐3′,5′‐deoxyguanosine...
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