Fig. 7. PGCs actively migrate towards their final target. (A-D) Fluorescent pictures taken at the indicated intervals from a time-lapse movie (the full movie can be found at http://dev.biologists.org/supplemental/ (Movie 3) showing the main cluster of PGCs during late somitogenesis on the right side of an embryo injected with full-vasa-GFP. Dorsal views, anterior is upwards. The Vasa-GFP fusion protein is localized into perinuclear granules in the PGCs, which migrate posteriorly relative to the somites; one somite boundary is marked with a black line.