Immediate commands (e.g. add mitosis, change track label) not put on undo Q
The undo Q only allows undoing commands initially run by the analysis (e.g. MATLAB).
AddMitosis and ChangeTrackLabel (and possibly other 'immediate' commands) can only be undone by removing the mitosis or changing the label back.
This goes to a more general question of being able to fully restore DB state to any point in the past