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The flavoprotein Cytochrome P450 reductase (CPR) is the unique electron pathway from NADPH to Cytochrome P450 (CYPs). The conformational dynamics of human CPR in solution, which involves transitions from a “locked/closed” to an “unlocked/open” state, is crucial for electron transfer. To date, however, the factors guiding these changes remain unknown. By Site‐Directed Spin Labelling coupled to Electron...