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Optimization of key seed characters (5–8) based on Mk1 model implemented in Mesquite. (A) ventral infold position (character 5), and (B) ventral infold divergence (character 6) inferred on a 46-terminal ML tree. (C) Ventral infold depth in cross section (character 7), and (D) endosperm shape (character 8) inferred on a 42-terminal ML tree. Seven key nodes are marked in (A).
