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This protocol describes a method of purifying antibodies from sera with denatured antigens immobilized on western blot membranes. Advantages include (1) fast and easy; (2) purification of antibody with antigen in denatured form allows high yield in case antigen protein solubility is limited. Disadvantage is that possible antibodies that recognize certain 3D structure in solution of antigens might not be purified using such a method. Regarding this issue, the flow through is recommended to be kept and can be used for other purification methods with folded antigens.