Add ADP+Pi state #10
Description
Use Case
It would be nice if, in addition to ATP and ADP states, actin monomers also had a ADP+Pi state.
Acceptance Criteria
Actin monomers can be in either ATP, ADP+Pi, or ADP states.
Details
The new ADP+Pi state should work similarly to the current ATP/ADP states, affecting reaction rates but not geometric constraints.
This state is important for biological function, so should be included in the models.