DRP1 down-regulation inhibits cell cycle exit of mitotic follicle cells. (A) Mitochondria (HSP-60 labeled) are more clustered in clones of drp1^KG (lacking UbiGFP) than in nonclonal cells in an S5 mitotic egg chamber. Bottom row shows magnification. Nuclei are stained with Hoechst. (B) Increased pH3 labeling occurs in drp1^KG clones (lacking UbiGFP) in the S5 egg chamber. (C) Quantification of pH3-positive cells in drp1^KG clones versus wild-type (WT) background in all mitotic stages. (D) Marf-1 RNAi clones (CD8GFP positive) have increased Hnt and HSP-60 immunolabeling relative to surrounding cells in an S5 mitotic egg chamber. (E) drp1^KG clones expressing Marf-1 RNAi (CD8GFP positive) show no increase in Hnt or HSP-60 immunolabeling in an S3 mitotic egg chamber. The white lines define the clone boundary, and the dotted lines outline the egg chambers. Bars, 10 µm.