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In nucleic acids, endo sugar puckers are more common than exo. In DNA, the sugar pucker can be either C2 ʹ endo (in B-form DNA) or C3ʹ endo (in A-form DNA). In RNA, however, the C2ʹ endo sugar pucker cannot be adopted because of steric hindrance between the OH group on C2 ʹ and the phosphate group on C3ʹ
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