Figure 1.

InR/mTOR signaling controls the timing of differentiation of photoreceptors 1,6,7 and cone cells. Differentiation of the 8 photoreceptor neurons and 4 non-neuronal cone cells (C) in the developing Drosophila eye begins with the differentiation of photoreceptor 8 posterior to the morphogenetic furrow (MF), followed by photoreceptors 2,5 and photoreceptors 3,4, then subsequently photoreceptors 1,6,7 and cone cells. InR/mTOR signaling, unk and hdc specifically regulates the timing of differentiation of photoreceptors 1,6,7 and cone cells (red). Anterior is to the left, dorsal is up.