Failure of salivary gland degeneration. Reduction in dorso-ventral class of indirect flight muscles. Some show proventriculus abnormality: foregut-midgut junction less proventriculus-like in appearance.
br6/br7 combination is lethal. Few adult escapers survive with short, broad wings. Adults of the br6/brrbp-3 or br6/brrbp-4 combination have reduced number of bristles on the palpus and have short, broad wings. Heterozygotes with Df(1)br25 have reduced viability and br wings.