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Dimer rows in bovine and rat mitochondria. Ribbons of ATP synthase dimers in tomograms of rat liver (A) and bovine heart (B) mitochondrial membranes. Black or white arrowheads indicate the same pairs of ATP synthase heads in (A) or (B), respectively. White arrowheads indicate the direction of perpendicular sections in the inserts. Slab thickness is 2.8 nm in panel A and 4.5 nm in panel B. Scale bars, 50 nm.
