Table 2. Potency of modified Bt toxins relative to native Bt toxins against resistant and susceptible strains of pink bollworm.

	Potency ratio for modified toxin relative to native toxina
Toxin pair	Resistant strain (BX-R)	Susceptible strain (APHIS-S)
Cry1AbMod/Cry1Ab	17	0.096
Cry1AcMod/Cry1Ac	43	0.29
Cry1AbMod/Cry1Ac	68	0.34
Cry1AcMod/Cry1Ab	11	0.083
Cry1AbMod/Cry2Ab	54	0.41
Cry1AcMod/Cry2Ab	34	0.35

^aLC₅₀ of a native toxin divided by the LC₅₀ of a modified toxin (based on data from Table 1). Potency ratios > 1 indicate the modified toxin was more potent than the native toxin; potency ratios <1 indicate the modified toxin was less potent than the native toxin.