UAS regulatory sequences drive expression of Upf2 in which amino acid resides 1143-1144 have been mutated from FV to RR.
Upf2FVRR.UAS/Scer\GAL4αTub84B.PL fails to rescue Upf214J
Upf2FVRR.UAS/Scer\GAL4αTub84B.PL fails to rescue Upf225G