Expression is observed in the somatic gonadal precursor cells.
Expression is observed in the gonadal mesoderm.
Expression is observed in all somatic cells of the embryonic gonad.
Expression is first observed at embryonic stage 11, in patches in the mesoderm of parasegments 2-14, with higher expression in posterior parasegments 10-12. By embryonic stage 12, cells maintaining expression of lacZ appear to be moving anteriorly towards parasegment 10.