Wild-type His1 gene in the context of a histone gene repeat tandem array.
Wild-type His2B gene in the context of a histone gene repeat tandem array.
Wild-type His3 gene in the context of a histone gene repeat tandem array.
Wild-type His4 gene in the context of a histone gene repeat tandem array.
A tandem array containing 6 copies of the histone gene repeat unit (each repeat contains one copy of each of His1, His2A, His2B, His3 and His4).