Rtnl1-GFP distribution in wild type (A-C, G), or msps (D-F) egg chambers (counterstained with phalloidin (red)). During stages 8 and 9 (A, B) Rtnl1 is distributed in a mesh-like array in the nurse cells, and is present at higher concentrations in the oocyte. The area denoted with * is a cross section through a ring canal and is enlarged in the inset. At stage 10 Rtnl1 decorates long fibers reminiscent of microtubules in the oocyte (C). Msps mutations (D-F) result in the aggregation of Rtnl1-GFP, much like Exu protein.