Toll protein is maternally delivered to developing oocytes. (A) Rhodnius oogenesis showing the tropharium (B), early (C), and late (D) oocytes in vitelarium. Chorionic stages are not displayed. (B) Toll protein is present in follicle cells of the tropharium. (C) Toll in early oocytes is likely delivered from nurse cells through trophic cords. (D) Protein in late oocyte cytoplasm and plasma membrane. Toll protein in green, actin to reveal cell perimeter in red, nuclei DAPI stain in blue. Nc: nurse cells; Oo: oocyte; Tc: trophic cord.