soluble glycogen synthase-related. similar to ATSS4/SSIV (STARCH SYNTHASE 4), transferase, transferring glycosyl groups [Arabidopsis thaliana] (TAIR:AT4G18240.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO41058.1); contains InterPro domain Starch synthase catalytic region (InterPro:IPR013534)