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 K27R, to prevent methylation) in the context of a histone gene repeat unit.
Wild-type His4 gene in the context of a histone gene repeat unit.
Contains three copies of the histone gene repeat unit (each repeat contains one copy of each of His1, His2A, His2B, His3 and His4). Each copy of the His3 gene has been mutated to contain the amino acid replacement K27R (to prevent methylation).