FIG. 3.
Determination of the DNase activity of naturally transformable C. jejuni strains and dns-positive nonnaturally transformable strains. DNase activity was assayed as described in the legend to Fig. 2. Fractions were isolated from naturally transformable C. jejuni strains C013199, C011338, C019168, C013500, and GB18 (lanes 1 to 5, respectively) and from dns-positive nonnaturally transformable C. jejuni strains C011300, C019165, C012446, C012599, CCUG10950, 21.97, 233.95, 260.94, 308.95, and 386.95 (lanes 6 to 15, respectively). Lane +, positive control (DNA treated with 1 μg DNase I); lane −, negative control (mock-treated DNA).