Fig. 7. Growth of germline and somatic tissues in the ovary is tightly coordinated. (A,B) An egg chamber with a dm² mutant germline (arrowhead) exhibits abnormal perdurance of Fas III expression in the overlying wild-type follicle cells. (C,D) By contrast, an egg chamber with a dm² mutant germline (arrowhead) expresses Broad Complex (BR-C) in the follicle cell layer on the basis of its age or position in the ovariole, rather than on its apparent maturity based on size. Note that the adjacent anterior egg chamber (arrow) is larger, but younger, and does not express BR-C. (E,F) An egg chamber in which all follicle cells are mutant for dm² (arrow) is abnormally small, with small nurse cells.