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Fig. 2. Embryonic-born projection neurons participate in the larval olfactory system. (A) GAL4-GH146 staining pattern in the larval brain as visualized by UAS-mCD8-GFP reporter. PN dendrites innervate the larval AL and their axons travel via the inner and outer antennocerebral tracts to innervate ipsilateral higher brain centers, the MB calyx and the presumptive LH. (B) Single-cell clones of embryonic-born PNs (one on each hemisphere) show that each innervates one glomerulus in the larval AL and sends its axon to the MB calyx and LH. (C1-C3) High magnification of larval AL for three single-cell clones. Rarely, two glomerulus-like structures are innervated by a single PN (C3). (D1-D3) High magnification of axon projections for three single-cell clones. (E1-E3) Higher magnification of MB for three single-cell clones; each PN innervates one or occasionally two glomeruli in the larval MB calyx. Note: images C1-E3 are from nine different animals. Arrows indicate dendrites in larval AL glomeruli. Arrowheads indicate axon termini in MB calyx glomeruli. iACT, inner antennocerebral tract; LAL, larval antennal lobe.





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