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Fig. 8. four-jointed influences the initiation of WG expression in the
proximal wing. fjd1 mutant clones, made using the
Minute technique and marked by absence of ß-galactosidase
(green). (A) Early third instar disc. WG expression is reduced within large
fj mutant clones (arrows). The requirement for fj is
non-autonomous, as fj mutant cells in the proximal wing express WG
normally (asterisk). Arrowhead identifies elevated WG expression in cells
immediately adjacent to wild-type cells. (B) Mid-third instar disc, arrows
point to reduced expression. (C) Mid-late third instar disc, with most tissue
mutant. WG expression is no longer noticeably reduced by absence of
fj (asterisk).