2.2.2 Phylogenetic tree construction
The amino acid sequences of GmolCXEs and CXEs from other species were aligned using ClustalX 2.0 (Larkin et al., 2007). A neighbor-joining tree was constructed by the program MEGA 8.0 using the neighbor-joining method with a p-distance model and a pairwise deletion of gaps (Tamura et al., 2013; Tan et al., 2018). Node support was assessed using a bootstrapping procedure with 1,000 replicates. And the Fig tree 4.3 is used as the auxiliary software to modify the tree (Wei et al., 2017). The protein names and accession numbers corresponding to the genes used for construction of the phylogenetic tree are listed in Table S1.