AP cell elongation patterns form an AP gradient.

<p>(A, B) AP cell length change shown for each analyzed cell, for timepoints 7.5, 10, and 12.5 min after GBE onset in anterior (A, wtLB009) and posterior views (B, wtCL051010). The color of the dot at the center of each cell corresponds to the scale bar shown. (A’, B’) Spatial maps summarizing AP cell length change over the 7.5–12.5 min time interval, as a function of the position of cells in the AP (<i>x</i>-axis) and DV (<i>y</i>-axis) embryonic axes, for anterior (A’) and posterior views (B’) (average for five and four embryos per views, respectively). (C, D) Graphs summarizing AP cell length change over the 7.5–12.5 min time interval, as a function of cell position in the AP axis, for anterior (C) and posterior views (D). (E) Graphs summarizing AP cell length change (<i>y</i>-axis), at 2.5, 5, and 7.5 min after the onset of GBE, as a function of cell position in the AP axis (<i>x</i>-axis) for posterior views (average for four wild-type embryos). The ribbon’s width shows the standard error (see <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1002292#sec009" target="_blank">Materials and Methods</a>). Data associated with this figure can be found in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1002292#pbio.1002292.s002" target="_blank">S2 Data</a>.