Construct: 4.6kb genomic fragment containing the fs(1)Yb transcription unit and part of the CG2701 transcription unit.
fs(1)Ybt4.6 fails to rescue fs(1)Yb1
P{fs(1)Ybt4.6} does not rescue fs(1)Ya2.
P{fs(1)Ybt4.6} does not rescue fs(1)Ya2.