Whole-mount in situ hybridization on early cleavage to domestage embryos. Embryos were hybridized with a vas cDNA fragment riboprobe. (See also Fig. 6 for schematic summary.) All panels show top views of embryos, except in B (side view). vas transcript is detected along the cleavage planes (arrows) of embryos at the 2-cell stage (A,B, same embryo) and 4-cell stage (C). These lines of expression persist through the 8-cell stage (D). vas RNA expression condenses into 4 subcellular clumps by the 32-cell stage (not shown), and remains in this configuration through the 1000-cell stage (E). By the 4000-cell stage (dome stage), vas RNA is no longer subcellularly localized and appears to fill the cytoplasm (F). There are 4-12 vasexpressing cells per embryo at the dome stage. Scale bar, 100 μm.
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