Binding of 125I-Cry1Ab to BBMV from the laboratory population at increasing concentrations of competitor. (A) Cry1Ab (▪, solid line), Cry1Aa (▴, broken line), Cry1Ac (•, dotted line), and Cry1Ja (○, dashed-dotted line). (B) Cry1Ab (▪, solid line), Cry1Fa (▵), Cry2Ab (✽), and Cry9Ca (⧫). Heterologous data with Cry1Ba, Cry1Ca, Cry1Da, and Cry2Aa are not shown, but they were essentially similar to those displayed.