... factor receptor ( DER ) signaling pathway. During the previtellogenic stages of oogenesis, the grk-DER signaling pathway defines the posterior pole of the oocyte by specifying posterior follicle cell identity. This is accomplished through the localized expression of Grk at the very posterior...

... and experimental data provide evidence that their formation requires inductive signals from the CNS midline cells. A combination of cell transplantation experiments and missexpression studies suggest that the DER signalling pathway is required at two steps of DM cell formation: firstly it is required to recruit DM...

... of parasegment 2, is among the earliest to be defined. It is soon divided into two distinct regions: the more dorsal pregland cells and the more ventral preduct cells. We show that it is the opposing activities of the Drosophila EGF receptor (DER) signaling pathway and the Fork head transcription factor...