jbug genomic fragment lacking the second transcriptional start site (deletion of 2L:22725543-22727564 ;22729274-22729816 (R6)). Sequence for a GFP tag is inserted into the sixth coding exon 6 (same location as in jbugGFP). It results in expression of GFP-tagged jbug proteins from transcripts RF, RL and RN and the expression of untagged protein from transcript RM under native control.