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Our experiments show that during blue native electrophoresis the
detergent bound to the proteins is replaced by the amphipathic Coomas-sie brilliant blue (CBB) dye. The mass of the bound CBB dye was quantified.

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and care is taken in the choice and concentration of the detergent used,
the mass of LacS, XylP and EIIMtl and four other membrane (transport)
proteins could be deduced within 10 % error.

Our data underscore the fact that the oligomeric state of many membrane transport proteins is dimeric.

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Provided this additional mass of bound CBB dye is accounted for
and care is taken in the choice and concentration of the detergent used,
the mass of LacS, XylP and EIIMtl and four other membrane (transport)
proteins could be deduced within 10 % error.
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