The starch-synthase enzymes used in this study were the second acetone precipitate and Fractions 21 and 23, Table 1, [Mukerjea, Ru.; Falconer, D. J.; Yoon, S.-H.; Robyt, J. F. Carbohydr. Res. 2010, 345, 1555-1563]. Fractions 21 and 23 had high specific activities of 544 and 944 International