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. 2001 Oct 1;29(19):3949–3954. doi: 10.1093/nar/29.19.3949

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Copyright © 2001 Oxford University Press

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Final 2|Fo|–|Fc| electron density maps for the mo⁴C_a9:A_b4 (A) and mo⁴C_b9:A_a4 (B) base pairs, and the corresponding chemical structure (C). Maps are contoured at the 1.1σ level by the program O (32). The chemical structure of the Watson–Crick mo⁴C:G pair found in the Dickerson–Drew type dodecamer with the sequence d(CGCGAATTmo⁴CGCG) (9) is shown at the bottom (D). Broken lines indicate possible hydrogen bonds. W indicates a water molecule.

Final 2|Fo|–|Fc| electron density maps for the mo⁴C_a9:A_b4 (A) and mo⁴C_b9:A_a4 (B) base pairs, and the corresponding chemical structure (C). Maps are contoured at the 1.1σ level by the program O (32). The chemical structure of the Watson–Crick mo⁴C:G pair found in the Dickerson–Drew type dodecamer with the sequence d(CGCGAATTmo⁴CGCG) (9) is shown at the bottom (D). Broken lines indicate possible hydrogen bonds. W indicates a water molecule.