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Superposition of the upfield region of 600 MHz 1H NMR spectra showing titration of perdeuterated CYP-S-CO with perdeuterated cytochrome b5 in 100% D2O, 50 mM potassium phosphate buffer, pH 7.4, 50 mM KCl. The 8-CH3 group of camphor shifts downfield upon cytochrome b5 titration, the 10-CH3 moves very slightly (Δδmax(obs) < 10 Hz) but noticeably downfield. The camphor 9-methyl resonance is not appreciably perturbed (peak not shown).
