D-mannonate + NAD(+) => 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(+)