Expression of a 1.9kb BamHI genomic fragment containing the sc basal promoter and the complete transcribed region is governed by a 5.7kb EcoRI fragment bearing the dorsocentral AS-C enhancer.
In an Df(1)sc10-1 background, two DC macrochaetae and several microchaetae form per heminotum. In a Df(1)260-1 background, many fewer DC macrochaetae form.