Fig. 5. Me31B is essential for oogenesis. Wild-type (A-C) and me31B^- (D-I) ovaries were stained with Hoechst (A,D,G) and phalloidin (B,E,H). (D-F) A typical me31B^- egg chamber, in which cell membranes of germline cells were collapsed. Ring canals and nurse cell nuclei in these egg chambers form aggregates. (G-H) A stage 10 me31B^- egg chamber showing nurse cell nuclei invading the region normally occupied by the oocyte.