Fig. 1. Proximodistal wing patterning. (A) Adult wing: distal (green), proximal wing and hinge (blue), and WG-expressing cells (red). The boundary between distal and proximal cells is an approximation. We adopt the term proximal wing for the blue region, but note that this entire region is sometimes referred to as the wing hinge. (B) Relative gene expression domains along the proximodistal axis, related to C by the dashed lines. Although for simplicity all genes are shown as having uniform expression levels, some are subject to modulation within their spatial domains (this work) (Williams et al., 1991; Clark et al., 1995; Villano and Katz, 1995; Brodsky and Steller, 1996; Ng et al., 1996; Rieckhof et al., 1997; Azpiazu and Morata, 2000; Casares and Mann, 2000; St Pierre et al., 2002; Wu and Cohen, 2002; Kolzer et al., 2003; Whitworth and Russell, 2003). (C) A wing imaginal disc, shaded as for the adult wing shown in A. Approximate location of DPP-expressing cells (yellow) is also indicated.