Contains the D. simulans Dsim\Nnk coding sequence (codon optimized for D. melanogaster), with flanking upstream and downstream sequences (1kb each) from D. melanogaster Nnk.
Expression of Dsim\NnkNnk.PK under the control of Scer\GAL4Act.PU rescues female lethality while it fails to rescue male lethality of NnkKK109638 expressing flies under the control of Scer\GAL4Act.PU.