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Binding constants and selectivity constants of the receptors 175a–d.
| 175a | 175b | 175c | 175d | Nonactin | |
| Kass (NH4+) [M−1] | 5.1 × 106 | 2.5 × 107 | 9.4 × 106 | 3.9 × 106 | 2.0 × 108 |
| Kass (K+) [M−1] | 3.0 × 104 | 5.7 × 104 | 2.4 × 104 | 5.7 × 104 | 6.7 × 107 |
| Kass (NH4+)/Kass (K+) | 173 | 437 | 393 | 68 | 3 |
