Turbidity reduction analysis of yeast (Y) and E. coli (E)-expressed LysA and LysA2. Specific activities of 1 μM endolysin were determined using mid-log phase cultures of L. fermentum 0605-B44 (Lf), L. brevis 0605-48 (Lb), and L. mucosae 0713-2 (Lm). To control for the effect of autolysis, rates from control samples (cells alone) were subtracted from the rates of experimental samples. Bars not connected by the same letter are significantly different (P < 0.05). Error bars represent the standard error of the mean (n = 3).