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- Flux control ratio + ('''Flux control ratios''' ''FCR''s are rat … '''Flux control ratios''' ''FCR''s are ratios of oxygen flux in different respiratory control states, normalized for maximum flux in a common reference state, to obtain theoretical lower and upper limits of 0.0 and 1.0 (0 % and 100 %). </br></br>For a given protocol or set of respiratory protocols, flux control ratios provide a fingerprint of coupling and substrate control independent of (''1'') mt-content in cells or tissues, (''2'') purification in preparations of isolated mitochondria, and (''3'') assay conditions for determination of tissue mass or mt-markers external to a respiratory protocol (CS, protein, stereology, etc.). ''FCR'' obtained from a single respirometric incubation with sequential titrations (sequential protocol; [[SUIT|SUIT protocol]]) provide an internal normalization, expressing respiratory control independent of mitochondrial content and thus independent of a marker for mitochondrial amount. ''FCR'' obtained from separate (parallel) protocols depend on equal distribution of subsamples obtained from a homogenous mt-preparation or determination of a common [[mitochondrial marker]].[[mitochondrial marker]].)