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Fig. 5. Marginal zone internalization without blastopore closure in Xdd1-expressing
embryos. Optical flow analysis of control (A; see Movie 2 in supplementary
material) and Xdd1-injected (B; see Movie 3 in supplementary material)
embryos. As indicated in the key in panel C, color denotes the direction of
flow in a' and b' (e.g. yellow lines indicate dorsal movement;
blue lines indicate ventral movement). Opposed flow (e.g. yellow meeting blue)
represents internalization and is highlighted with white boxes. Cell tracings
of Xdd1-injected embryos (D,d') also reveal the internalization of cells
in both the marginal zone and yolk plug.
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