Figure 3.

Lysin activity on various streptococci. Representative streptococcal strains were exposed to 250 units of purified lysin, and the OD₆₅₀ was monitored. The activity of lysin for each strain was reported as the initial velocity of lysis, in −OD₆₅₀/min, on the basis of the time it took to decrease the starting OD by half (i.e., from an OD₆₅₀ of 1.0 to 0.5). All assays were performed in triplicate, and the data are expressed as means ± standard deviations.