5kb genomic sequence containing the entire wild-type His3.3B transcription unit.
His3.3B+t5 is a suppressor of sterile phenotype of His3.3A2X1/Df(2L)BSC110, His3.3BK9R
The sterility of His3.3BK9R/His3.3BK9R; His3.3A2X1/Df(2L)BSC110 males and females is rescued by His3.3B+t5.