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Cyclic AMP content in purified HCNCB proteins expressed as molar ratio (protein/cAMP)
| Molar ratio (protein/cAMP) | n | |
|---|---|---|
| HCN1CB | 6 ± 2 | 5 |
| HCN2CB | 49.5 ± 8.5 | 4 |
| HCN4CB | 24 ± 5 | 3 |
| HCN1CB monomer/dimer | 17 ± 2.7 | 3 |
| HCN1CB tetramer | 2.2 ± 0.36 | 3 |
| HCN1CB ΔC-linker | 25 ± 3 | 3 |
| HCN1CB R538E | 40 | 1 |
