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Schematic alignment of SPS proteins from plants and the cyanobacterium Synechocystis sp. PCC 6803. The glucosyltransferase domain is shown in blue, the SPP-like domain in red, and the linker region in green. The positions of the phosphorylation sites involved in light-dark regulation (Ser-158), 14-3-3 protein binding (Ser-229), and osmotic stress activation (Ser-424) of the plant SPS are indicated by the arrows.
