Table 2.

Specific activities of the beta-lactamase of the WT, M8 and M256 strains (see Figure 1), before and after adaptation to cefotaxime (see Figure 5). The results are presented as the means and standard deviations of three biological duplicates. For each biological replicate, two independent measurements were performed.

Strains	Beta-lactamase activity
	Before adaptation	After adaptation
Supernatant	0	0
WT	21.6 ± 2.9	23.3 ± 4.5
M8	21.4 ± 3.3	17.2 ± 1.3
M256	491.3 ± 3.6	3.6 ± 1.8