Circadian neuron subgroups exhibit distinct dynamics of activity in response to WLS conditions. Bioluminescence traces for individual cells from each circadian neuron subgroup. Each trace in one panel represents bioluminescence from one individual cell. A, Bioluminescence traces from brains subjected to control LD without phase advancing light signals for 8 d (black traces), then placed in DD conditions (blue traces, gray shade; s-LNv = 18 cells, l-LNv = 19 cells, LNd = 18 cells, DN1 = 27 cells, DN3 = 18 cells). B, Bioluminescence traces from brains subjected to WLS LD conditions. WLS conditions entail pre-WLS (black trace, white shade), WLS (red trace, white shade), post-WLS (black trace, green shade), followed by DD (blue trace, gray shade; s-LNv = 17 cells, l-LNv = 17 cells, LNd = 15 cells, DN1 = 28 cells, DN3 = 30 cells).