A construct bearing the lncRNA:CR42858 lncRNA gene fragment without its endogenous promoter, inserted back into the genomic locus from which the original lncRNA:CR42858 lncRNA had been deleted (by virtue of the attP site in the progenitor knock-in reporter cassette).
Sequence encoding the cDNA of the lncRNA:CR42858 lncRNA, without its endogenous promoter, has been inserted into the attP site in TI{TI}lncRNA:CR42858KO.