Mitochondrial Structure: Two Types of Subunits on Negatively Stained Mitochondrial Membranes

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Abstract
Projecting subunits were seen on the cristae of all 11 types of mitochondria examined by electron microscopy. These consisted of a stem, 30 to 35 Å wide and 45 to 50 Å long, and a round head 75 to 80 Å in diameter. The outer membranes of rat liver mitochondria showed regular arrays of hollow cylindrical subunits 60 Å by 60 Å.