Mitotic compartment apical PM folds from metaphase 11 to telophase 11 in control RNAi, Cnn RNAi, and Zip RNAi embryos. PIP₂ probe color-coded by depth (scale shown). Surrounding pseudocleavage furrows are red-orange (deeper) in control RNAi and Zip RNAi, and green (shallower) in Cnn RNAi. Arrows indicate apical surfaces corresponding to the middle domain between the two nascent caps of the telophase compartment. In control RNAi, folds present in the middle of the apical domain at metaphase are lost by telophase (seen in 10/10 embryos). In Cnn RNAi, the middle of the apical domain remains folded from metaphase to telophase (seen in 8/8 embryos). In Zip RNAi, the middle of the apical domain remains folded from metaphase to telophase (seen in 10/10 embryos).