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. Author manuscript; available in PMC: 2018 Dec 18.
Published in final edited form as: Curr Biol. 2017 Dec 7;27(24):3826–3836.e5. doi: 10.1016/j.cub.2017.11.023

Figure 7. Origin and specification of the Drosophila wing.

Figure 7

At stage 11, wg is expressed in continuous dorso-ventral stripes in each segment of the embryo. As the initial group of Dll expressing cells (red circles) contributes to both the DP and VP we refer to them as thoracic primordia (TP). By stage 12, Doc is activated by Dpp and represses wg in the lateral ectoderm. The dorsal primordia (DP, green circle) originates from two populations of cells: one within the TP (cells that had previously expressed Dll) and a second group dorsal to the TP. As embryogenesis progresses the DP separates from the VP. The bottom panels show the known inputs into Dll and sna-DP when Dll is first activated (left) and when sna-DP is activated (right).