TABLE 2.

Toxicity of the active Cry proteins to neonate larvae of E. insulana from the Spanish insect colony^a

Protein	LC50 (μg/ml)	Relative potency	95% fiducial limits of relative potency		Slope ± SE	Intercept ± SE
			Lower	Upper
Cry1Da	4.25	0.06	0.09	0.04	1.93 ± 0.15	−1.22 ± 0.10
Cry1Ba	0.40	0.65	0.87	0.50	2.34 ± 0.19	0.92 ± 0.10
Cry1Ac	0.27	1.00			1.55 ± 0.17	0.89 ± 0.10
Cry9Ca	0.20	1.33	1.01	1.74	2.71 ± 0.28	1.90 ± 0.20

^aParameters were obtained from the POLO-PC program (27). The χ² value was not significant (P > 0.05) for a goodness-of-fit test for each regression. Slopes could not be fitted in parallel. The relative potency was expressed as the ratio of the LC₅₀ value for each Cry protein to the LC₅₀ value for Cry1Ac (39).