A roX1 cDNA with the SL1 domain deleted is cloned downstream of Hsp83 promoter sequences.
lncRNA:roX1-SL1.Hsp83 fails to rescue Df(1)52/lncRNA:roX1MB710
The presence of roX1ΔSL1.Hsp83 fails to rescue roX1MB710 Df(1)52 male viability to wild-type levels.