... presenting the pulse of Src activity in the plane of the inactive and active fractions, si and s1. If the duration of the stimulus exceeds the critical value, the trajectory in the (si, ... transition from the Offstate to On state (in the bistability domain). Regardless of the slope, the active Src fractions increase during the Off to On transition, whereas the value of the inac-tive ... 2009 The Authors Journal compilation ª 2009 FEBSparameters and, for clarity of exposition, we present the analysis of the Src cycle in terms of Eqns (6–8).Intrinsic regulatory properties of the...