D-mannuronate + NADPH + H(+) => D-mannonate + NADP(+)
d-mannuronate + nadph + h(+) => d-mannonate + nadp(+)
D-mannuronate + NADPH + H(+) => D-mannonate + NADP(+)
d-mannuronate + nadph + h(+) => d-mannonate + nadp(+)