UAS regulatory sequences drive expression of bnl tagged with GFP.
viable
air sac primordium | cell non-autonomous | somatic clone | third instar larval stage, with Scer\GAL4btl.B123
Random clonal expression of bnlUAS.GFP in the air sac primordium under the control of Scer\GAL4btl.B123 has the non-autonomous effect of surrounding cells forming a new branch.