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Effects of CckA residue changes H399A (HA) and Y589D (YD) on cell lysis. Increased cell lysis results in increased optical density at 855 nm (OD855). The results of one-way ANOVA [F(5,12) = 6.46, P = 0.004] and t tests of two a priori hypotheses are indicated (n = 3). (The asterisk indicates significance at 0.05; ns, not significant.)
