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A purified low-spin form of cytochrome P-450 was isolated from phenobarbital-induced rabbit liver microsomes. The preparation was functionally active and free from cytochromes b5 and P-420 and phospholipids. The specific content of the cytochrome was 18 nmoles per mg of protein. At the molecular weight of the hemoprotein of 50,000, it corresponds to 90% of purification. The purified hemoprotein binds substrates of type II and some substrates of type I. The complexes formed reveal spectral properties, similar to those for the complexes of these substrates with the microsomal form of cytochrome P-450.
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