emc2/Df(3L)Ar11 animals have many ectopic macrochaetae, especially on the dorsal notum.
The posterior scutellar bristle is displaced from its normal position in emc2/emc11 flies. Most sensory mother cells emerge earlier in emc11/emc2 wing discs compared to wild-type, although the precursor of the posterior scutellar bristle appears later than normal.
The density of chaetae in emc1/emc2 flies with different doses of sc+ show a saturation effect on the notum, wing and tergite. The spatial distribution of the chaetae results from cell interactions probably by a mechanism of lateral inhibition.