Figure 7.

Breakdown of attractors for the segment polarity network model. (A) Diagram showing the subsystems involved in specifying each of the attractors A₁, ..., A₁₀ in the model (attractors shown in Additional file 4). For each path (from top to bottom), that collection of subsystems is unique to the attractor at the bottom of the path. (B) The 5 main subsystems are also sufficient to specify the 3 experimentally observed attractors A₁, A₂ and A₃. These 5 subsystems are composed of subsystems from the original set. $S_A^{\ast }$ = S_A∪ S_D2 ∪ S_E2 ∪ S_H2; $S_{B1}^{\ast }$ = S_B1 ∪ S_F2 ∪ S_J2; $S_{B2}^{\ast }$ = S_B2 ∪ S_F1 ∪ S_J1; $S_{C1}^{\ast }$ = S_C1 ∪ S_G2; $S_{C2}^{\ast }$ = S_C2 ∪ S_G1