The development of nervous systems involves reciprocal interactions between neurons and glia. In the Drosophila olfactory system, peripheral glial cells arise from sensory lineages specified by the basic helix-loop-helix transcription factor, Atonal. The
Arrows point to double-labelled cells. The section was counterstained with DAPI. GCL, ganglion cell layer. INL, inner nuclear layer. Scale bar = 50 µm. retinal neurons at equivalent distances from the optic nerve (ON) to the periphery of the retina (25%, 50%, 75%, and 95%, ...