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A.–C. are electron micrographs of mitochondria undergoing either fission or fusion (white circle) in the inner segment. D.–I. Representative electron micrographs of suspected mitochondrial fusion based on the criteria of Bereiter-Hahn and Voth [25] who showed using real time imaging that the branching in E and F resulted in fusion. The bends seen in D., E. H. and I. are associated with greater motility. Scale bar = 0.5 μm.
