UASt regulates expression of Tag:FLAG-tagged aln.
Scer\GAL4aln.Δ/alnUAS.Tag:FLAG rescues alnΔ-Gal4
Scer\GAL4ort.C2/alnUAS.Tag:FLAG rescues aln2
alnUAS.Tag:FLAG/Scer\GAL4CarT-HA-T2A-Gal4 fails to rescue aln2