β-galactosidase activity exhibited by different transposon mutants and <i>trans</i>-complemented strains.

<p>The data represent mean values (± standard deviation) from three independent experiments performed in triplicate. Asterisks indicate statistically significant differences (**—<i>p</i><0.01; ***—<i>p</i><0.001) according to Student’s unpaired <i>t</i>-test.