Fig. 4.

Phylogenetic tree (left) and the DNA structure (right) of PSYs. Phylogenetic tree: dicot plants are indicated by open squares, monocot plants by triangles, and loquat genes by filled squares. Amino acid sequences were aligned using ClustalW and a Neighbor–Joining tree was constructed with a 1000-bootstap replication support using MEGA5 software. DNA structure: boxes and thin bars indicate exons and introns, respectively; The DNAs having five exons are indicated with red boxes and those with six exons with black boxes.