Expression of fzo-1 and eat-3 does not promote complete mitochondrial fusion. (A) Schematic of the mitochondrial morphologies observed in embryos. (B) Wild-type (+/+) or drp-1(tm1108) transgenic lines expressing mitogfp in the presence of fzo-1 (P_HSmitogfp + P_HSfzo-1), eat-3 (P_HSmitogfp + P_HSeat-3), or both fzo-1 and eat-3 (P_HSmitogfp + P_HSfzo-1 + P_HSeat-3) were analyzed by Nomarski optics and fluorescent microscopy. Quantification of the different mitochondrial morphologies observed and the number of embryos and transgenic lines analyzed are indicated. The outlines of representative cells are indicated with dashed circles. Videos 8–10 show 3D reconstructions of the embryos indicated by asterisks.