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.
Wild-type His3 gene in the context of a histone gene repeat unit.
Wild-type His4 gene in the context of a histone gene repeat unit.
Genomic fragment consisting of one copy of the histone gene repeat unit (contains one copy of each of His1, His2A, His2B, His3 and His4).