Construct: fs(1)Ya+tXSR contains the same genomic DNA fragment as fs(1)Ya+t6.5, except that the most 3' 1.9kb have been removed (this contains the 3' half of the fs(1)Ya transcription unit and 0.6kb of downstream sequence) and then replaced with sequence encoding the 3' half of the full-length fs(1)Ya cDNA.
fs(1)Ya+tXSR rescues fs(1)Ya2