TABLE 1.

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

Protein	LC50 (μg/ml)	Relative potency	95% fiducial limits of relative potency		Slope ± SE	Intercept ± SE
			Lower	Upper
Cry1Ia	21.13	0.052	0.04	0.06	3.25 ± 0.35	0.71 ± 0.47
Cry1Da	4.94	0.22	0.16	0.31	1.66 ± 0.16	3.85 ± 0.12
Cry1Ac	1.09	1.00			1.87 ± 0.17	4.92 ± 0.06
Cry1Ba	1.03	1.11	0.84	1.42	1.53 ± 0.17	4.98 ± 0.07
Cry9Ca	0.39	2.78	2.32	3.35	3.67 ± 0.31	6.49 ± 0.14
Cry1Ab	0.45	2.41	1.80	3.23	1.29 ± 0.13	5.44 ± 0.07

^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).