Switch in FGF signalling initiates glial differentiation in the Drosophila eye

Glial cells have an essential role in the building and wiring of nervous systems. They generally migrate over long distances before they initiate differentiation, but the molecular pathways coordinating the switch from glial migration to glial differentiation are largely unknown. The study of glial cells in the Drosophila eye disc now implicates fibroblast growth factor (FGF) signalling proteins in this process.