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The functional model of HMT genes in plants. The rectangles represent HMT genes. The blue and red rectangles indicate the type 1 HMT genes in expression pattern, while the white rectangles denote other three types: type 2, type 3, and type 4. The blue and red triangles represent methyl donors R,S-SAM and SMM, respectively. The squares in dotted lines indicate different plant organs.
