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Hydrogenase promoter activity in M. acetivorans. β-Glucuronidase activity (UidA activity) was measured for M. acetivorans strains carrying single-copy reporter gene fusions to each M. barkeri and M. acetivorans hydrogenase promoter. The growth substrates used were methanol (black bars), methanol plus H2 (open bars), and acetate (striped bars).
