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Phylogeny of functional spermatophyte STSs. Outer ring is the phylogenetic tree of all 394 spermatophyte STSs, inner ring is the global phylogenetic tree of representative plant STSs. Red branches represent TPS-a subfamily STSs, light blue branches represent TPS-b subfamily STSs, green branches represent TPS-d subfamily STSs, blue branches represent TPS-f subfamily STSs, pink branches represent TPS-g subfamily STSs.
