UAS regulatory sequences drive expression of sxc carrying the amino acid replacement K872M (this mutation has been shown to result in a protein with no catalytic activity in vitro).
Scer\GAL4Tub.PU/sxcK872M.UAS fails to rescue sxc6/sxc1
The expression of sxcK872M.Scer\UAS under the control of Scer\GAL4tub.PU does not rescue the pharate adult stage lethality of sxc1/sxc6 heterozygotes.