Sequence logos of the cNMP-binding protein superfamily. Sequences were aligned using PROBE with a purge value of 150. The average information at conserved positions is 0.915 bits. The conserved glycines important for β-barrel formation are located at: motif 1, positions 16, 23, and 35; motif 2, positions 12 and 16. cAMP contact residues are located at: motif 2, position 17; motif 3, position 2.