In Delta w RNAi the rate of follicle cell mitosis is decreased. Wildtype (A,B) andDelta RNAi (C,D) two days after dsRNA injection stained for f-actin with Phalloidin (red) and for an antibody recognizing phosphorylated Histone-3 (green). (B,D Anti-phospho-histone (PH3) channel only). (A,B) In wildtype, cell divisions are restricted to early follicle cells and rather scattered than concentrated to distinct regions. Mitosis can be found in the posterior part of the tropharium during early follicle growth and also in those follicle cells that may contribute to stalk formation. (C,D) Upon Delta RNAi, follicle cell cease mitosis.