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Solution structure of the wild-type cAMP-free CNBD. (A) Superposition of backbone traces of a family of 15 NMR structures with the lowest CYANA target function. Backbone atoms of the amino- and carboxy-terminal ends (residues Q216-R220 and A351-A355, respectively) are not shown and were not used for least-square superposition of the structures. (B) Ribbon representation of wild-type cAMP-free CNBD. Secondary structure elements are labeled.
