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Insect bioassays. (A) Survival of insects after injection with the spores of the WT and different mutants. Control insects (CK) were injected with 0.05% Tween 20. (B) Comparison of the LT50 values for the WT and different mutants. Values are means plus SE. Values that are significantly different from the value for the WT by log rank tests are indicated by asterisks as follows: ****, P < 0.0001; **, P = 0.0087; *, P = 0.0182.
