Differential expression of genes annotated for vht (F420 non-reducing hydrogenase) and frhADGB (F420 reducing hydrogenase) in M. acetivorans. Panel A) The genes encoding the frhADGB F420 reducing hydrogenase subunits. Panel B) The genes encoding the vhtG1A1C1D1 and the vhtG2A2C2 F420 non-reducing hydrogenases. The Genebank identification number (MA number) is shown below each gene while the individual gene designation is shown above. Panel C) RT-PCR data for the indicated genes.