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In this review we compare situations under which the major cellular role of mitochondria, oxidative phosphorylation (OXPHOS), is transiently suppressed. Two types of cellular bioenergetics exist, related to the predominance of glycolysis either disconnected or fully connected to OXPHOS: i) “glycolytic” phenotype, when the glycolytic end-product pyruvate is marginally used for OXPHOS; and, ii) OXPHOS...