Fig. 6. Patterns of muscle contraction in embryos with and without synaptic transmission. (Left) Muscle contractions recorded at 15-minute intervals from an embryo that lacks all evoked synaptic transmission through pan-neuronal expression of active tetanus toxin (elav-GAL4;UAS-TNT-G). (Right) Similar recording made from a control embryo expressing inactive tetanus toxin (elav-GAL4;UAS-TNT-VIF). For each genotype, four embryos were recorded and analysed. Similar data were obtained in each case, but for clarity, results from single embryos are shown. Arrow indicates the first complete wave of forward peristalsis.