Fig. 2. grk RNA particles specifically accumulate at apparent ring canals. (A,B) Trails of grk RNA (also see Movie 3 in the supplementary material) and lacZ RNA injections into wild-type nurse cells. Schematics on the left represent the site of injection (red outline) and show the average speed±standard error of the mean (S.E.), the number of egg chambers injected and the total number of particles tracked for analysis (n). Trails at 1 second intervals were superimposed (1 minute duration). Red arrows indicate the direction of RNA particle movement; broken lines show those particles which seem to follow nurse cell cytoplasmic streaming, and were thus not tracked for analysis. Anterior is to the left and dorsal is to the top. Scale bar: 5 µm.