In the early embryo, β-gal expression in a double row of the dorsal-most epidermal cells, at amnioserosa and dorsal epidermis boundary. Expression in ovary described as: "Adult Ovary-Bellen: follicle cells (stage 9), epithelial sheath, muscular sheath, trachea." Identity of "muscular sheath" and trachea (of ovary?) not certain.
Expressed at amnioserosa/dorsal epidermis boundary.