Insertion upstream of CG9775. Transcription is initiated in the region downstream of the w gene carried in the inserted P{wHy} element. This downstream region is derived from sequence that is located 3' to the endogenous w locus. An intron is spliced out of this region in the mutant transcript and in addition, a second intron splices to the first exon of the 5' UTR of CG9775, 23bp downstream of the annotated transcription start site, resulting in the transcript containing CG9775 sequences.