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Standard base-pairing relationships
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Description
Standard base-pairing relationships (a) compared with examples of the anomalous base-pairing that occurs as a result of tautomeric shifts (b).

(a) Standard base-pairing arrangements /H CH3 O--- \ _ // / H—C/ \N—H N \ / 1 \\o Thymine (keto) Adenine (amino) (b) Anomalous base-pairing arrangements CH3 Thymine (enol) Guanine (keto) H H \N—H-- N H \c— / oc_\\ C/ \\§c/ ”‘Q” “"< \ I \\O---H—N/= H Cytosine (amino) H \ H N-- \c_c// // \ H—C N—H \ _ / l \\o Cytosine (imino) Guanine (keto) Adenine (amino)
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