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Figure 5
The NAD+ cofactor molecule bound in subunit A of the Ade/2′-dAdo complex, shown in 2Fo − Fc electron density contoured at 1σ. The flat electron density of the nicotine ring confirms the oxidized state of the cofactor.

IUCrJ
Volume 4| Part 3| May 2017| Pages 271-282
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517002433