Figure 4

Expansion cell cycles permit much more neural progenitor cell (NPC) death at later cell cycles (CCs). Ventricular zone (VZ) output plotted as described in Figure 1. During expansion CCs, d _i = 0.05; NPC death during subsequent CCs is indicated on the x-axis. (A, B) After three expansion CCs the plausibility window is centered at 29% using model D_G1 (A) and 24% using model D_G2 (B). (C, D) After four expansion CCs the plausibility window is centered at 37% using model D_G1 (C) and 28% using model D_G2 (D). (E, F) After five expansion CCs the plausibility window is centered at 53% using model D_G1 (E) and 36% using model D_G2 (F).