Fig. 4. Redirecting Fis1p to peroxisomes by expression of a Fis1p-Pex15p fusion protein rescues the peroxisomal fission defect in vps1/fis1 cells. Expression of Fis1p rescues the mitochondrial phenotype to that of wild-type cells, but restores the peroxisome phenotype to that of vps1 cells. Expression of Fis1p-Pex15p does not rescue the mitochondrial phenotype, but restores the peroxisome phenotype to that of wild-type cells. Images are flattened z-stacks. Scale bar: 5 µm.