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Fig. 6. Polo overexpression restores BicDPA66 protein function during
early oogenesis. (A,B) C(3)G is in red and BicD in green. (A)
BicDPA66 ovariole with no cell in meiosis from stage 2b of
the germarium, and diffuse localization of BicD. (B)
BicDPA66 ovariole overexpressing Polo. Each follicle
contains an oocyte in meiosis, which accumulates BicD. (C) DNA staining
of later stage follicles in a BicDPA66 ovariole
overexpressing Polo. Stage 4 and stage 6 follicles contain an oocyte marked by
the presence of the condensed DNA (arrowheads). The follicle at stage 9 is
degenerating. (D) Model of a positive feedback loop between Polo and
BicD proteins during meiosis restriction and oocyte differentiation. The Polo
kinase is required to trigger meiosis and to activate BicD-dependent
transport. In turn, BicD is required for the transport of oocyte determinants
and for Polo localization.