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Fig. 1. Embryonic-born projection neurons exhibit characteristic connectivity in
the adult olfactory system. (A-D) Many projection neurons innervating
glomeruli in the adult AL are born during embryogenesis. (A) The GAL4-GH146
enhancer trap is expressed by 
90 PNs innervating approximately 40 of the
50 glomeruli in the adult AL. (B) A lateral neuroblast clone labeled by
early larval heatshock innervates 11 of these glomeruli. (C) An anterodorsal
neuroblast clone labeled by early larval heatshock innervates a
non-overlapping subset of 12 glomeruli. (D) An anterodorsal neuroblast clone
labeled by early embryonic heatshock innervates at least 15 additional
non-overlapping glomeruli. Asterisks indicate superficial glomeruli that are
innervated by embryonic but not larval-born PNs. (E-L) Each embryonic-born PN
generally innervates one glomerulus in adult AL (E1-L1) except VL2p+ (F1, see
Table 1). Each glomerular class
of PN exhibits a characteristic axon branching pattern in the MB calyx and LH
(E2,E3-L2,L3 show two examples of each glomerular class). In this and
subsequent figures, all brains were stained with anti-mCD8 (green, reporter
for GAL4 or MARCM clones) and nc82 (magenta, marking neuropiles), and
presented as flattened confocal stacks oriented with midline to the left and
dorsal to the top unless otherwise noted. aD, anterodorsal; e HS, embryonic
heatshock; GAL4-GH146, whole GH146 driver expression in AL; Lat, lateral; l
HS, larval heatshock; Nb, neuroblast.
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