Fig. 2.

Numerical simulations of solutions of drug on-off state systems (3.4) and (3.5) with different low and upper threshold values. Case 2: (A–B) Blue cure for the solution with C^TH = 1300ul⁻¹, C_TH = 350ul⁻¹, pink curve for the solution with C^TH = 1400ul⁻¹, C_TH = 350ul⁻¹; Case 3: (C–D) Blue cure for the solution with C^TH = 1300ul⁻¹, C_TH = 150ul⁻¹, pink curve for the solution with C^TH = 1400ul⁻¹, C_TH = 350ul⁻¹, and green curve for the solution with C^TH = 1300ul⁻¹, C_TH = 100ul⁻¹; Case 4: (E–F) Blue cure for the solution with C^TH = 700ul⁻¹, C_TH = 150ul⁻¹, and green curve for the solution with C^TH = 700ul⁻¹, C_TH = 100ul⁻¹.