Figure 6

Histological assessment of LsRXR RNAi. HES (Haematoxylin-erythrosin-saffron) stained section (3μm) through oocytes (A) and ovary (B) of control lice (row 1) and LsRXR RNAi (row 2 and 3) (scaling bar: 50μm). (2) shows the section through a very mature louse (egg strings had started to hatch at time point of sampling, full genital segment) with relatively low RNAi effect (some copepodids hatched) while (3) shows a section through a strongly effected louse (no hatching of eggs). Note the less organized oocytes with no distinct vitellin crystals and the ovary did not contain any oogonia. The whole lice corresponding to sections in each row are shown in (C) (scaling bar: 5 mm).