D-mannuronate + NADH + H(+) => D-mannonate + NAD(+)
d-mannuronate + nadh + h(+) => d-mannonate + nad(+)
D-mannuronate + NADH + H(+) => D-mannonate + NAD(+)
d-mannuronate + nadh + h(+) => d-mannonate + nad(+)