3.2.1.68 down the isoform ISA1 transcript level is low during starch degradation 716600 3.2.1.68 additional information isoform ISA2 transcript is relatively abundant during periods of either starch biosynthesis or catabolism 716600 3.2.1.68 up the expression of isoform ISA2 is higher than that of the other two isoforms ISA1 and ISA3 in tuberous root at 109 days after planting 751833 3.2.1.68 up the isoform ISA1 transcript level is elevated in tissues where starch is synthesized 716600