Fig. 5
Isoprene production per cell of all strains generated after 6 h of incubation in closed vials, in the absence of nickel or in the presence of 2.5 µM NiCl2. The results were split into two panels for better visualization. In each panel, the isoprene production of both control strains was also included. Light grey area represents the production range observed for all samples of both controls, while the dark grey area represents the 25–75% range of the controls. All boxes represent values of at least six replicates from at least two independent experiments