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Fig. 7. elbow1 is a regulatory double mutant of both
el and noc. (A) Immunostaining of wild-type third instar
wing imaginal discs with anti-El (red) and anti-Noc (green) antibodies. (B)
Immunostaining of el1 homozygous mutant third instar wing
imaginal discs with anti-El (red) and anti-Noc (green) antibodies. Note that
the mutant does not show the wedge-like staining along the dorsal-ventral
boundary that is characteristic of wild-type third instar wing discs. Since
both, El and Noc stainings are affected, we conclude that
el1 is a regulatory double mutant affecting both
genes.