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Phylogenetic analysis of the amino acid sequences of SS in 74 plant species. Sequences classified into subfamilies I-VI are shown in colour. Clades I, II, III, IV and VI/V/VII represent SSI, SSII, GBSS, SSIV and SSV, respectively, of 74 plant species. The branches of protein sequences found in maize are highlighted in red with a light blue background. For detailed species IDs, please refer to Supplementary Table 1.
