Fig. 2.

A Drosophila larval nervous system comprising ventral nerve cord, central brain, and optic lobes. At optic lobes, sequential transition of neuroepithelial (NE) stem cells to neuroblasts (NBs) occurs (in box). NE stem cells undergo symmetric cell division to expand the pool of cells and subsequently give rise to NBs that divide asymmetrically to produce ganglion mother cells, which undergo mitotic division to produce neuronal daughter cells. CTPsyn forms cytoophidia at the NE stem cell region of the optic lobe. Created with BioRender.com