Fig. 8. Patterns of muscle contraction with and without sensory input. (Left) Muscle contractions recorded at 15-minute intervals from an embryo without sensory input (PO163-GAL4;UAS-TNT-G). (Right) A similar recording made from control embryo with normal synaptic transmission from sensory neurons (PO163-GAL4;UAS-TNT-VIF). For each genotype, five embryos were recorded and analysed, but results from single representative embryos are shown. In embryos with no sensory input, a burst of muscle contractions occurred 17 hours AEL, as in controls. However, the first properly coordinated sequences are delayed in embryos that lack sensory input (arrows).