A low color or colorless polymaleate as determined by a Gardner color number of 8 or less, said polymaleate is prepared by aqueous solution polymerization of 70 to 99. proteins encoded by such nucleic acid molecules: and use of the proteins and nucleic acid molecule. The AD converters have a first operation mode in which they operate with a first number of conversion bits and at a first conversion speed and a second operation mode in which they operate with a second number of conversion bits and at a second conversion speed. In particular, the correct answer arrangements of adjacent testees are adjusted to be different from one another.