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The method is direct, sensitive, and does not rely on the use of any labeled material.There are very few generic methods to assess the stability and functional properties of membrane proteins solubilized in detergent. For this purpose, a thiol-reactive fluorochrome N-[4-(7-diethylamino-4-methyl-3-coumarinyl)phenyl]maleimide (CPM) can be used. An unfolding profile is obtained when the fluorochrome becomes fluorescent on reaction with cysteine residues that have been exposed during thermal denaturation of the protein population. The method wa