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Competition with labeled Cry1Aa and mutant toxins to B. mori brush border membrane vesicles (BBMV) (bars represent error of n = 4). Cry1Aa wild type protein, (○-○); F313A mutant protein, (◊-◊); F333A-F335A, mutant protein (▽-▽); F461A mutant protein, (◆-◆); and, F328A mutant protein, (▲-▲). % uncompeted toxin indicates the % of labeled toxin remaining bound to BBMV in the presence of unlabeled cold toxin competitor.
