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Neighbor-joining phylogenetic tree of wheat, rice, Arabidopsis and maize Hsf families. The N-proximal regions (from the start of the DNA-binding domain to the end of the HR-A/B region) of the Hsf proteins were used to construct the phylogenetic tree with MEGA 5.0. For wheat (Ta), rice (Os), Arabidopsis (At) and maize (Zm) Hsf proteins, classes A, B and C are in green, yellow and blue, respectively, both transcript ID and subclass names are shown
