Wild-type His1 gene in the context of a histone gene repeat unit.
Wild-type His2A gene in the context of a histone gene repeat unit.
Wild-type His2B gene in the context of a histone gene repeat unit.
Mutated His3 gene (amino acid replacement S28A, resulting in a non-phosphorylatable residue) in the context of a histone gene repeat unit.
Wild-type His4 gene in the context of a histone gene repeat unit.