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Fig. 7. Model for hindgut elongation by Upd/JAK/STAT signaling. Expression of
upd in the small intestine (SI) under the control of Drm and Lin
results in the formation of a gradient of Upd protein in cells posterior to
the small intestine. In response to signaling by Upd, a gradient of Stat92E is
established; this leads to the orientation of cell rearrangement in the
hindgut.
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