(A, A') Dsulf1 expression (red in A) detected in late 3rd instar wing disc containing clonal cells (green) over-expressing an active form of Ci (CiAct). Note that Dsulf1 expression is not detected within the clone but is activated ectopically, in cells adjacent to Flp>CiAct cells (arrowhead in A and A’). (B, B') Dsulf1 expression (red in B) detected in late 3rd instar wing disc containing a clone of cells expressing a dominant-negative form of EGFR, marked by GFP (Flp>EGFRDN, green). Note the repression of endogenous Dsulf1 expression within Flp>EGFRDN clones. (C-D) Wing discs expressing a constitutively activated form of the EGF receptor (ap>EGFRCA, C) or Rhomboïd (ap>Rho, D) in the dorsal compartment display an autonomous ectopic up-regulation of Dsulf1 expression.