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Fig. 13. Ecdysis-triggering hormone (ETH)-induced cyclic 3',5'-guanosine monophosphate (cGMP) immunoreactivity in the ventral nerve cord of intact or ligated pharate larvae 10-15 min after the initiation of ecdysis behaviour. (A—D) Ecdysing intact pharate larvae showed strong cGMP staining in 27/704 neurons of all ventral ganglia. (E—H) ETH-induced ecdysis behaviour of isolated abdomens was associated with a strong cGMP response in abdominal ganglia. Note that in most abdominal ganglia, only cells 27 show strong cGMP elevation. Abbreviations: SG, suboesophageal ganglion; TG2, thoracic ganglion 2; AG3-5, abdominal ganglia 3-5; TAG, terminal abdominal ganglion. Scale bar, 200 µm.