a–d, Confocal fluorescence micrographs showing the localization of RPA-1–YFP in ABplpappap (arrowheads) in ced-3(lf); ltIs44; opIs263 embryos after the indicated RNAi treatment. Insets, magnified views of ABplpappap. e, Genes identified as suppressors of the sterility of lrr-1(lf) mutants19 were tested for suppression of cell extrusion. f, Nomarski micrograph showing a cell extruded (arrow) from a wild-type embryo after gmpr-1(RNAi) treatment. Scale bars, 10 μm.