Mutated His4 gene (amino acid replacement K16Q), in the context of a histone gene repeat unit.
Df(2L)HisC, His1HisGU.wt, His2AHisGU.wt, His2BHisGU.wt, His3HisGU.wt, His4HisGU.H4K16Q, His4rΔ has short lived phenotype
Epidermal Df(2L)HisC clones in His4rΔ homozygotes that also express 12 copies of a HisGU gene unit with a His4[H4K16Q] substitution (bearing His1HisGU.wt, His2AHisGU.wt, His2BHisGU.wt, His3HisGU.wt, and His4HisGU.H4K16Q) are able to form normal-looking adult structures with sensory bristles.