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Fig. 6. Vg and Notch upregulate cpa transcription in the wing blade
primordium. (A-F') Third instar wing imaginal discs.
(A,B,D-F) Standard confocal sections. (C) Optical cross section, stained with
anti-Arm to outline the apical membrane. Clones are positively labeled with
GFP (green in D',E',F'). (A,C,D,D';E,E')
cpa antisense probe to reveal cpa mRNA expression (white in
A,C,D,E and magenta in D',E') in wild type (A,C) or in clones
overexpressing vg (white arrow in D,D') or in clones
overexpressing Nintra (white arrow in E,E'). As
cpa mRNA accumulates on the basal surface of the wing disc
epithelium, standard confocal sections fail to reveal cpa
accumulation in all vg and N- overexpressing clones. (B)
cpa sense probe: the background level is very low. (F) Clones
overexpressing Nintra, stained with anti-Vg (white in F or
magenta in F'). Vg is misexpressed.