Fig. 3. Short Osk^imm controls polar granule morphology. Polar granule and nuclear body morphology in gastrulating embryos revealed by GFP-Aub (green) and immunostaining for Osk (red). Embryos are from otherwise wild-type mothers bearing a single copy of the following transgenes: (A) P[osk^imm3'mel]; (B) P[M1L-osk^imm3'mel], (C) P[M103L-osk^imm3'mel]; (D) P[M103,106L-osk^imm3'mel]. Polar granule morphology is shifted towards the D. immigrans type in A-C, but not D. Although there are spherical bodies in A-C, they are all in nuclei (i.e. nuclear bodies), and the cytoplasmic polar granules are not spherical. Scale bar: 5 µm.