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Fig. 1. Development of the olfactory lobe in Drosophila. (A) Olfactory
lobes (encircled with broken red lines) are visualized in the brain (marked
with broken white lines) by expression of GFP driven by SG18.1-Gal4.
Neurons enter the lobe through the antennal nerve (AN) and cross over to the
contralateral side through the antennal commissure (AC). Scale bar: 100 µm.
(B) Olfactory lobes of Or47b-Gal4/+;UAS-NsybGFP (UNG12)/+ stained
with mAbnc82 (red). Projections to the glomerulus VA1 can be seen (arrow
indicates the AC). Scale bar: 50 µm. (C,D). Schematic diagrams summarizing
cellular events occurring during lobe development in the early (C) and late
pupa (D). In the early pupa (
18-30 hours APF), sensory neurons enter the
brain via the antennal nerve (arrowhead) and traverse in the outer nerve layer
in close association with glial cells (red). Ato-derived `pioneer' neurons
arrive at the lobe first (purple) and guide the rest of the neurons (green) to
the antennal commissure (arrow). At this time, the projection neurons (blue)
are already present within the lobe. Sensory neurons invade the lobe from
about 25 hours APF. (D) Termination of sensory neurons (green) and their
contact with appropriate projection neurons (blue) is followed by ensheathing
of the neural elements to form glomeruli.
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