Movie 4.

NC14 tll- and hkb-MS2 dynamics when light is applied at different developmental times. Sequential movies show tll-MS2 bursts in NC14 and then hkb-MS2 bursts in NC14 when high light is applied starting in either NC13 (top) or NC14 (bottom). Teal and magenta nuclear masks show nuclei with a burst in corresponding frames. Timer (mm:ss) shows time since the start of NC14. Scale bar is 10 μm.