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(A–D, E, F) Embryos stained with antibodies against Vasa protein at cleavage cycles C3, C5, C10, C14A (stages 1–5), as well as stage 6 and stage 8. Lateral views, anterior is to the left, dorsal is up. Arrow in (F) indicates the position of the pole cells after their inwards migration. (C') scanning electron micrograph (SEM) of C10 embryo; close-up in (C'') shows pole cells.
