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Phylogenetic tree, motif and gene structure of ZmPHT1 genes. (a) The phylogenetic tree contains only ZmPHT1s, which were divided into two groups (Class A and Class B); (b) exons are indicated by grey boxes, and introns are indicated by single lines; black lines represent untranslated regions (UTR); (c) motifs’ analysis; different colors represent different motifs.
