A concentration dependent transition for Kinetic Scheme channels. The rate is expressed as the dissociation constant, Kd (mM) and the off-lifetime, reciprocal of the off-rate, tau-r (ms). The misnamed "ion" list selection should point at the binding agent, which need not be an ion, but can be any element of a KSSolution.
|     field |     type   |     contents / default value |     |
| Kd | double | 1.0 | Kd: Kd for the binding of the agent |
| tau_r | double | 1.0 | tau_r: timescale for reverse (unbinding) transition |
| KSRateConc-results | object | CalcResults |