Relationships between the primary amino acid sequences of SSs and glycogen synthase of E. coli. The dendrogram was generated using the PileUp program from Genetics Computer Group (Devereaux et al., 1984). The amino acid sequences used for the analysis are as follows (accession numbers given where reference not cited): wheat GBSS (Ainsworth et al., 1993), wheat SSI (Li et al., 1999), wheat SSII-A, wheat SSII-B, and wheat SSII-D (this paper), rice GBSS (X62134), rice SSI (D16202), maize GBSS (M24258), maize SSI (AF036891), maize SSIIa and maize SSIIb (Harn et al., 1998), maize SSII (Gao et al., 1998), pea GBSS (X88789), pea SSII (X88790), potato GBSS (X58453), potato SSI (Y10416), potato SSII (X87988), potato SSIII (X94400), and E. coli glycogen synthase (GS; J01616). Five groups of enzymes are labeled as GBSS, SSI, SSII, SSIII, and GS.