Subcellular localization of eGFP-Beclin 1-ER and eGFP-Beclin 1-MITO, as well as the corresponding targeted control constructs, in mouse embryonic fibroblasts-wild type (MEF-WT). (A) MEF-WT cells were transfected with eGFP-Beclin 1-ER or eGFP-ER as indicated, and labelled against endoplasmic reticulum (ER) marker BAP31. (B) MEF-WT cells were transfected with eGFP-Beclin 1-MITO and eGFP-MITO as indicated, and labelled against mitochondrial marker TOM20. The arrows indicate one of the structures showing colocalization. Images were taken with a confocal microscope and one optical section is shown. Asterisks indicate cells expressing the constructs. Scale bars, 10 μm.