UASp regulatory sequences drive expression of grk with a stop codon introduced after the dibasic putative cleavage site (resulting in a secreted form of grk protein).
egg chorion, with Scer\GAL4otu.PR
11% of eggs derived from females expressing grksec.Scer\UAS.P\T under the control of Scer\GAL4otu.PR have a weakly dorsalised eggshell.