EcollacZsbb-k00702 is expressed in cells just anterior to the A/P boundary in the wing disc; the pattern is mutually exclusive to that of tkv. EcollacZsbb-k00702 expression in the haltere disc is also mutually exclusive with that of tkv.
Larval expression is observed along the anterior edge of the anterior/posterior compartment boundary of the wing disc, and fades anteriorly. Expression is also observed in the lateral-most cells of the wing disc. A representative image can be seen in FBrf0174525, Figure 3 F.