Genomic fragment encompassing grk (includes 600bp upstream of the transcription start site and 200bp downstream of the transcriptional end site). The first intron 5' and 3' splice sites (GT and AG respectively) have both been mutated to TT.
some die during embryonic stage, with grkHF/grkΔFRT
some die during first instar larval stage, with grkHF/grkΔFRT
grkss-mut partially rescues grkHF/grkΔFRT