Figure 3.

Tissue-specific localization of Thor expression. Thor expression is detected only in the central nervous system in embryos (A), but in many tissues in larvae and adults, e.g., the fat body (B), testes (B, *), and ring gland (C) of third instar larvae and the ovarian nurse cells (D) of adult females. Probes of A-C are digoxigenin-labeled, whereas D shows nuclear B-galactosidase staining of the Thor-enhancer trap as this shows more clearly that nurse cells as early as stage 4 express Thor.