a reduced flavin + NAD(+) <=> an oxidized flavin + NADH + 2 H(+)
a reduced flavin + nad(+) <=> an oxidized flavin + nadh + 2 h(+)
a reduced flavin + NAD(+) <=> an oxidized flavin + NADH + 2 H(+)
a reduced flavin + nad(+) <=> an oxidized flavin + nadh + 2 h(+)