Figure 4

Phase portraits for the normal-to-cancer (NTC) phase transition model. Phase portraits for four different values of a. Panel A shows a = -50, E = -700, -400, 0, 300. Panel B shows a = -10, E = -30, -10, 0, 100. Panel C shows a = 0, E = 0, 100, 300. Panel D shows a = 50, E = 0, 300, 700.