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Fig. S2 Comparison of tracking strategies. Quantitative analysis of anterior and posterior cell movements in wild type similar to Smith et al. (2008), i.e., without correction for drift of the embryo during imaging or for displacement of heart within the embryo. Note that speed differences between posterior and anterior cells are maintained as in the analysis that uses the base of the lumen as a reference point (Figs. 3-5), but speed values are higher, in agreement with Smith et al. (2008).
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