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. 2015 Dec 8;6:10031. doi: 10.1038/ncomms10031

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Shown are measured S profiles of gap expression boundaries plotted as a function of AP position at each of the 10 time classes, with blue bands representing 95% CI of S. The two dotted lines denote mid-embryo (relative AP position ξ=0.5) and perfect scaling (S=0), respectively.