Six follicle-cell types are distinguishable on the morphological and on the molecular level. Schematic drawing, S10B. Each population is indicated by a different colour and consists of multiple cells which are not shown in detail, except for the polar cells (2 cells) and the border cells (6–10 cells). Anterior is to the left. The position of the oocyte nucleus (black) marks the dorsal side. BC: border cells, cFC: centripetal follicle cells, mFC: mainbody follicle cells, NC: nurse cells, Ooc: oocyte, PC: polar cells, sFC: stretched follicle cells, tFC: terminal follicle cells.