Figure 2: Negative image of an ethidium bromide-stained agarose gel with DNA fragments obtained after enzymatic amplification of the [NiFe] hydrogenase gene from genomic DNA of D. vulgaris BCMPS82 using the following primer pairs: Hyd2F-Hyd7R (lane 2), Hyd1F-Hyd7R (lane 3), Hyd4F-Hyd7R (lane 4), Hyd2F-Hyd5R (lane 5), and Hyd1F-Hyd5R (lane 6). DNA size markers (Bio-Rad) were applied to lanes 1 and 7.