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Summary of proposed criteria to differentiate BF enzymes from non-BF NADH-dependent enzymes. An overlay of the T. maritima HydB (green) and the T. thermophilus Nqo1 (red) sequences is shown. The location of the proposed differential criteria that demarcate beta subunits from BF and non-BF NADH-dependent enzymes are numbered at the bottom from (1) to (6) and the relevant region of the sequence is indicated by arrows.
