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Fig. 1. Metamorphosis of the thoracic ventral (Tv) neurosecretory cells. (A) Schematic transverse section of the ventral nervous system, showing the axons, dendrites and cell bodies of a pair of Tv cells, before metamorphosis. The axons are wrapped around a pair of support cells (dorsal neurohemal organ), situated outside the neural sheath. (B) Projected confocal Z-stack of CD8::GFP expression in the thoracic neuromeres of an early metamorphic individual (18 hours apf) of the genotype UAS-CD8::GFP;FG10-GAL4. Expression in the thorax is limited to the three pairs of Tv neurons (arrows point to somata). (C) Dorsal view of the Tv cell axons, immunostained with {alpha}-SCP, at various time points during metamorphosis.