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Competitive adsorption isotherms for two conservative surface charge-neutralizing mutants of cytochrome b 5 , E11Q and E44Q, previously measured with competitor concentration held constant over the range of the isotherm, were used to test three widely-used multi-component isotherm models. The extended Langmuir–Freundlich, Langmuir and Jovanovic–Freundlich models each adequately described the...