This entry represents a protein family that uses NAD(P)H to reduce FMN and regenerate FMNH2. This entry also includes the NADH-dependent enzyme MsuE from Pseudomonas aeruginosa, which serves as a partner to an FMNH2-dependent alkanesulphonate monooxygenase. The NADP-dependent enzyme from Escherichia coli is outside the scope of this model.