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Saturation of 125I-Cry2Ab-specific binding to H. armigera BBMVs. A fixed amount of BBMVs (20 μg of vesicle proteins) was incubated with increasing amounts of 125I-Cry2Ab for 1 h. The binding reaction was stopped by centrifugation, and the radioactivity retained in the pellet was measured. Nonspecific binding was calculated by incubating with an excess of unlabeled Cry2Ab and subtracted from the total binding.
