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Fig. 5. Inner cells can move over outer cells. A time-lapse series of a
Drosophila embryo showing inner cells (those not adjacent to the
ectoderm) moving over outer cells (see Movie 3 in the supplementary material).
(A) A 2 µm z-series at 0:31:00 showing a labelled cell (white dot
and arrow) that is, at this time, the most laterally placed cell. (B) A
reconstructed cross-sectional time-series in which the labelled cell (white
dot and arrows) is overtaken by inner cells (arrowheads). (C) A
z-series at end of the time-lapse showing that at deeper z-slices new cells
(arrowhead) are now more dorsolaterally placed than the labelled cell (arrow).
Scale bar: 20 µm.