Mutated His2A gene (amino acid replacements K117R/K118R/K121R/K122R, to prevent ubiquitylation) in the context of a histone gene repeat unit.
Df(2L)HisC homozygotes carrying the His2AHisGU.4K-4R transgene arrest development at the end of embryogenesis but show no detectable defects on their cuticle.
Clones of His2AHisGU.4K-4R mutant cells differentiate to normal epidermal structures in the cuticle of adult flies and display no bristle defects.