Fig. 4. Expression of pannier (pnr) in the wing disc of Calliphora vicina. (A) The boundary of pnr expression in the medial half of the developing notum at 8 hours after pupariation (arrowheads). The lateral limit of pnr expression appears to correspond to the position of the future precursors of the dorsocentral row, visualised in B by 22C10 staining. This seems to be a conserved feature with other species of cyclorraphous Schizophora: a similar correlation has been described in Ceratitis capitata and Drosophila. (C) A schematic representation of how the expression domains of pnr (shown in pink) in the wing disc correlate with bristle positions on the imaginal notum of the three species. Note that dorsocentral (DC) bristles are always positioned at the limit of pnr expression, but that the bristle patterns differ. aDC, anterior DC; aSC, anterior scutellar; pSC, posterior scutellar.
